1
Q
Define anatomy.
A
The study of the structure of the body and its parts
Anatomy is a branch of biology that deals with the structure of organisms.
2
Q
Define physiology.
A
The study of the functions of the body’s parts
Physiology explains how the body works and the processes that occur within it.
3
Q
Describe how structure and function are complementary to one another.
A
Structure determines function and vice versa
The relationship between structure and function is fundamental in biology.
4
Q
List the levels of structural organization.
A
- Chemical
- Cellular
- Tissue
- Organ
- Organ system
- Organism
These levels represent the complexity of biological organization.
5
Q
Define the eight functional characteristics of life processes of humans.
A
- Maintenance of boundaries
- Movement
- Responsiveness or irritability
- Digestion
- Metabolism
- Excretion
- Reproduction
- Growth
These characteristics are essential for maintaining life.
6
Q
List the survival needs of the human body.
A
- Nutrients
- Oxygen
- Water
- Normal body temperature
- Appropriate atmospheric pressure
These needs are critical for sustaining life.
7
Q
Define homeostasis.
A
The maintenance of a stable internal environment
Homeostasis is crucial for the proper functioning of the body.
8
Q
Describe the three interdependent components of all homeostatic control mechanisms.
A
- Receptor
- Control center
- Effector
These components work together to maintain homeostasis.
9
Q
Define negative feedback.
A
A mechanism that reverses a change in a controlled condition
Example: Regulation of body temperature.
10
Q
Define positive feedback.
A
A mechanism that enhances a change in a controlled condition
Example: Blood clotting process.
11
Q
Define anatomical position.
A
A standard position of the body used as a reference
In this position, the body is standing upright, facing forward, with arms at the sides and palms facing forward.
12
Q
Identify the planes of the body.
A
- Midsagittal or median
- Sagittal or parasagittal
- Frontal/coronal
- Horizontal/transverse
- Oblique
These planes are used to describe locations and movements in the body.
13
Q
Define anterior (ventral).
A
The front of the body
This term is used to describe the position of body parts.
14
Q
Define posterior (dorsal).
A
The back of the body
This term is used to describe the position of body parts.
15
Q
Define superior (cephalic or cranial).
A
Above or higher than another part
This term is used to describe the position of body parts.
16
Q
Define inferior (caudal).
A
Below or lower than another part
This term is used to describe the position of body parts.
17
Q
Define medial.
A
Toward the midline of the body
This term is used to describe the position of body parts.
18
Q
Define lateral.
A
Away from the midline of the body
This term is used to describe the position of body parts.
19
Q
Define intermediate.
A
Between medial and lateral structures
This term is used to describe the position of body parts.
20
Q
Define proximal.
A
Closer to the origin of the body part
This term is used to describe the position of body parts.
21
Q
Define distal.
A
Farther from the origin of the body part
This term is used to describe the position of body parts.
22
Q
Define prone.
A
Lying face down
This term describes a position of the body.
23
Q
Define supine.
A
Lying face up
This term describes a position of the body.
24
Q
Define plantar.
A
Relating to the sole of the foot
This term is used to describe the position of body parts.
25
Define **palmar**.
Relating to the palm of the hand
## Footnote
This term is used to describe the position of body parts.
26
Define **superficial**.
Toward or at the body surface
## Footnote
This term is used to describe the position of body parts.
27
Define **deep**.
Away from the body surface
## Footnote
This term is used to describe the position of body parts.
28
Identify the **body cavities** and their major contents.
* Dorsal body cavity: Cranial cavity, Vertebral cavity
* Ventral body cavity: Thoracic cavity, Abdominopelvic cavity
## Footnote
These cavities house and protect internal organs.
29
Define **serous membrane**.
A membrane that lines body cavities and covers organs
## Footnote
It consists of parietal and visceral layers with serous fluid.
30
Define **tissue**.
A group of cells that work together to perform a specific function
## Footnote
Tissues are the building blocks of organs.
31
List the **four primary tissue types**.
* Epithelial
* Connective
* Muscle
* Nervous
## Footnote
Each type has distinct functions and characteristics.
32
List the **six special characteristics of epithelium**.
* Polarity
* Specialized contacts
* Supported by connective tissue
* Avascular but innervated
* Regeneration
* Basement membrane
## Footnote
These characteristics define epithelial tissue.
33
Define **basement membrane**.
A thin, fibrous layer that supports epithelial tissue
## Footnote
It consists of basal lamina and reticular lamina.
34
Describe **simple squamous epithelium**.
* Cell layers: Single layer
* Cell structure: Flat
* Location: Alveoli of lungs
* Function: Diffusion
## Footnote
This type of epithelium facilitates rapid exchange of materials.
35
Describe **simple cuboidal epithelium**.
* Cell layers: Single layer
* Cell structure: Cube-shaped
* Location: Kidney tubules
* Function: Secretion and absorption
## Footnote
This type of epithelium is involved in secretion and absorption.
36
Describe **simple columnar epithelium**.
* Cell layers: Single layer
* Cell structure: Tall and column-like
* Location: Digestive tract
* Function: Absorption and secretion
## Footnote
This type of epithelium often contains goblet cells.
37
Describe **pseudostratified columnar epithelium**.
* Cell layers: Appears stratified but is single layer
* Cell structure: Column-like
* Location: Respiratory tract
* Function: Secretion and movement of mucus
## Footnote
This type of epithelium often has cilia.
38
Describe **stratified squamous epithelium**.
* Cell layers: Multiple layers
* Cell structure: Flat
* Location: Skin, mouth
* Function: Protection
## Footnote
This type of epithelium protects underlying tissues.
39
Describe **stratified cuboidal epithelium**.
* Cell layers: Two or more layers
* Cell structure: Cube-shaped
* Location: Sweat glands
* Function: Protection and secretion
## Footnote
This type of epithelium is rare in the body.
40
Describe **stratified columnar epithelium**.
* Cell layers: Two or more layers
* Cell structure: Column-like
* Location: Male urethra
* Function: Protection and secretion
## Footnote
This type of epithelium is also rare.
41
Describe **transitional epithelium**.
* Cell layers: Multiple layers
* Cell structure: Dome-shaped
* Location: Urinary bladder
* Function: Stretching
## Footnote
This type of epithelium allows for expansion.
42
Define **cilia**.
Hair-like structures that help move substances across cell surfaces
## Footnote
Example: Cilia in the respiratory tract move mucus.
43
Define **gland**.
An organ that produces and secretes substances
## Footnote
Glands can be endocrine or exocrine.
44
Differentiate between **exocrine and endocrine glands**.
* Exocrine: Secrete products into ducts
* Endocrine: Secrete hormones into the bloodstream
## Footnote
This distinction is based on secretion methods.
45
Differentiate between **unicellular and multicellular glands**.
* Unicellular: Single cell (e.g., goblet cells)
* Multicellular: Multiple cells (e.g., sweat glands)
## Footnote
This classification is based on the number of cells.
46
Differentiate between **simple and compound glands**.
* Simple: Unbranched duct
* Compound: Branched duct
## Footnote
This classification is based on duct structure.
47
Describe **tubular exocrine glands**.
Glands with a tube-like structure
## Footnote
Example: Intestinal glands.
48
Describe **alveolar (acinar) exocrine glands**.
Glands with a sac-like structure
## Footnote
Example: Salivary glands.
49
Describe **tubuloalveolar exocrine glands**.
Glands with both tubular and sac-like structures
## Footnote
Example: Pancreatic glands.
50
Describe **holocrine glands**.
Glands that secrete entire cells filled with product
## Footnote
Example: Sebaceous glands.
51
Describe **apocrine glands**.
Glands that secrete part of the cell with the product
## Footnote
Example: Mammary glands.
52
Describe **merocrine glands**.
Glands that secrete products via exocytosis
## Footnote
Example: Sweat glands.
53
List the **main classes of connective tissue**.
* Connective tissue proper
* Cartilage
* Bone
* Blood
## Footnote
Each class has distinct functions and characteristics.
54
Identify the **four major functions of connective tissue**.
* Support
* Protection
* Insulation
* Transportation
## Footnote
These functions are essential for maintaining body structure and function.
55
Identify the **three common characteristics of connective tissue**.
* Common origin (mesenchyme)
* Varying degrees of vascularity
* Extracellular matrix
## Footnote
These characteristics define connective tissue.
56
Describe **ground substance** in connective tissue.
The non-cellular material in the extracellular matrix
## Footnote
It can be liquid, gel-like, or solid.
57
Describe **fibers** in connective tissue.
* Collagen: Strong and flexible
* Elastic: Stretchable
* Reticular: Supportive network
## Footnote
These fibers provide strength and support to connective tissue.
58
Define **-blast and -cyte** cells.
* -blast: Immature, actively dividing cells
* -cyte: Mature, less active cells
## Footnote
These suffixes indicate the stage of the cell.
59
Describe **mast cells**.
Cells that release histamine and heparin during inflammation
## Footnote
They play a role in the immune response.
60
Describe **macrophages**.
Large cells that engulf and digest pathogens and debris
## Footnote
Other names include histiocytes, Kupffer cells, and microglial cells.
61
Describe **mesenchyme**.
Embryonic connective tissue that gives rise to all other connective tissues
## Footnote
It is composed of loosely organized cells.
62
Describe **mucous connective tissue (Wharton's jelly)**.
A type of embryonic connective tissue found in the umbilical cord
## Footnote
It provides support and flexibility.
63
Differentiate among **areolar connective tissue**.
* Cell type: Fibroblasts
* Matrix arrangement: Loose
* Location: Under epithelia
* Function: Support and cushioning
## Footnote
This type of connective tissue is widely distributed throughout the body.
64
Differentiate among **adipose tissue**.
* Cell type: Adipocytes
* Matrix arrangement: Loose
* Location: Under skin
* Function: Energy storage and insulation
## Footnote
This type of connective tissue stores fat.
65
Differentiate among **reticular connective tissue**.
* Cell type: Reticular cells
* Matrix arrangement: Network of fibers
* Location: Lymphoid organs
* Function: Support
## Footnote
This type of connective tissue forms a supportive framework.
66
Differentiate among **dense fibrous connective tissue**.
* Cell type: Fibroblasts
* Matrix arrangement: Densely packed fibers
* Location: Tendons
* Function: Provide strength
## Footnote
This type of connective tissue connects muscles to bones.
67
Differentiate among **dense irregular connective tissue**.
* Cell type: Fibroblasts
* Matrix arrangement: Randomly arranged fibers
* Location: Dermis of skin
* Function: Withstand tension
## Footnote
This type of connective tissue provides strength in multiple directions.
68
Differentiate among **elastic connective tissue**.
* Cell type: Fibroblasts
* Matrix arrangement: Elastic fibers
* Location: Walls of arteries
* Function: Stretch and recoil
## Footnote
This type of connective tissue allows for flexibility.
69
Describe the **physical and chemical characteristics of cartilage**.
Avascular, flexible, and resilient tissue
## Footnote
It provides support and cushioning in joints.
70
Define **perichondrium**.
A dense connective tissue layer that surrounds cartilage
## Footnote
It provides nutrients and support.
71
Define **chondroblasts**.
Cells that produce cartilage matrix
## Footnote
They are responsible for cartilage growth.
72
Define **chondrocytes**.
Mature cartilage cells found in lacunae
## Footnote
They maintain the cartilage matrix.
73
Define **lacunae**.
Small cavities in cartilage that house chondrocytes
## Footnote
They provide space for the cells.
74
Define **appositional growth**.
Growth of cartilage by adding new layers to the outside
## Footnote
This process increases the thickness of cartilage.
75
Define **interstitial growth**.
Growth of cartilage from within by cell division
## Footnote
This process increases the length of cartilage.
76
Differentiate among **hyaline cartilage**.
* Cell type: Chondrocytes
* Matrix arrangement: Glassy, smooth
* Location: Nose, trachea
* Function: Support and flexibility
## Footnote
This type of cartilage is the most common.
77
Differentiate among **elastic cartilage**.
* Cell type: Chondrocytes
* Matrix arrangement: Elastic fibers
* Location: Ear
* Function: Flexibility
## Footnote
This type of cartilage maintains shape while allowing flexibility.
78
Differentiate among **fibrocartilage**.
* Cell type: Chondrocytes
* Matrix arrangement: Thick collagen fibers
* Location: Intervertebral discs
* Function: Absorb shock
## Footnote
This type of cartilage provides tensile strength.
79
Differentiate among **bone**.
* Cell type: Osteocytes
* Matrix arrangement: Hard, calcified
* Location: Skeleton
* Function: Support and protection
## Footnote
Bone is a rigid connective tissue.
80
Differentiate among **blood**.
* Cell type: Erythrocytes, leukocytes
* Matrix arrangement: Liquid (plasma)
* Location: Circulatory system
* Function: Transport nutrients and waste
## Footnote
Blood is a fluid connective tissue.
81
Differentiate among **lymph**.
* Cell type: Lymphocytes
* Matrix arrangement: Liquid
* Location: Lymphatic system
* Function: Immune response
## Footnote
Lymph is a fluid connective tissue involved in immunity.
82
Define **epithelial membrane**.
A membrane composed of epithelial tissue and connective tissue
## Footnote
It includes mucous, serous, and cutaneous membranes.
83
Differentiate among **mucous membrane**.
* Location: Lines body cavities open to the exterior
* Function: Secretion and absorption
## Footnote
Mucous membranes produce mucus.
84
Differentiate among **serous membrane**.
* Location: Lines closed body cavities
* Function: Reduces friction between organs
## Footnote
Serous membranes produce serous fluid.
85
Differentiate among **cutaneous membrane**.
* Location: Skin
* Function: Protection
## Footnote
The cutaneous membrane is the largest organ of the body.
86
Differentiate among **synovial membrane**.
* Location: Joints
* Function: Lubrication of joints
## Footnote
Synovial membranes produce synovial fluid.
87
Differentiate among **skeletal muscle**.
* Structure: Striated, multinucleated
* Location: Attached to bones
* Function: Voluntary movement
## Footnote
Skeletal muscle is under voluntary control.
88
Differentiate among **smooth muscle**.
* Structure: Non-striated, spindle-shaped
* Location: Walls of hollow organs
* Function: Involuntary movement
## Footnote
Smooth muscle is under involuntary control.
89
Differentiate among **cardiac muscle**.
* Structure: Striated, branched
* Location: Heart
* Function: Pumping blood
## Footnote
Cardiac muscle is under involuntary control.
90
Define **neuron**.
A nerve cell that transmits electrical impulses
## Footnote
Neurons are the basic units of the nervous system.
91
Define **neuroglia**.
Supporting cells in the nervous system
## Footnote
Neuroglia provide support and protection for neurons.
92
Describe the process of **tissue repair**.
The process of healing and regeneration of damaged tissue
## Footnote
It involves inflammation, tissue formation, and remodeling.
93
Identify the tissue composition of the **epidermis**.
Stratified squamous epithelium
## Footnote
The epidermis is the outermost layer of skin.
94
Identify the tissue composition of the **dermis**.
Dense irregular connective tissue
## Footnote
The dermis provides strength and elasticity to the skin.
95
Identify the tissue composition of the **hypodermis**.
Adipose tissue and loose connective tissue
## Footnote
The hypodermis anchors the skin to underlying structures.
96
Identify the function of **keratinocytes**.
Produce keratin, a protective protein
## Footnote
Keratinocytes are the most abundant cells in the epidermis.
97
Identify the function of **melanocytes**.
Produce melanin, the pigment responsible for skin color
## Footnote
Melanocytes protect against UV radiation.
98
Identify the function of **Merkel cells**.
Sensory receptors for touch
## Footnote
Merkel cells are found in the epidermis.
99
Identify the function of **Langerhans cells**.
Immune response in the skin
## Footnote
Langerhans cells are part of the skin's defense system.
100
Describe the process by which **keratinocytes become pigmented**.
Keratinocytes absorb melanin from melanocytes
## Footnote
This process is important for skin protection.
101
Describe the function of the **stratum basale**.
Site of cell division and new keratinocyte formation
## Footnote
It is the deepest layer of the epidermis.
102
Describe the function of the **stratum spinosum**.
Provides strength and flexibility to the skin
## Footnote
It contains desmosomes that connect keratinocytes.
103
Describe the function of the **stratum granulosum**.
Keratinization begins in this layer
## Footnote
It contains keratohyalin granules.
104
Describe the function of the **stratum lucidum**.
Provides an extra layer of protection in thick skin
## Footnote
It is found only in thick skin areas.
105
Describe the function of the **stratum corneum**.
Provides a protective barrier against environmental damage
## Footnote
It is the outermost layer of the epidermis.
106
Describe the composition and function of the **dermis**.
* Composition: Dense irregular connective tissue
* Function: Provides strength and elasticity
## Footnote
The dermis contains blood vessels, nerves, and glands.
107
Describe the **papillary layer** of the dermis.
The upper layer of the dermis with dermal papillae
## Footnote
It contains capillaries and sensory receptors.
108
Describe the **reticular layer** of the dermis.
The deeper layer of the dermis with dense connective tissue
## Footnote
It provides strength and houses larger blood vessels.
109
Describe the **three pigments** that contribute to skin color.
* Melanin
* Carotene
* Hemoglobin
## Footnote
These pigments influence skin tone and color.
110
Describe how different skin colors are determined.
* Number of melanocytes
* Amount of melanin produced
* Color of melanin
## Footnote
These factors contribute to individual skin color variations.
111
Describe the tissue origin and tissue composition of **nails, hair, and glands**.
Derived from epidermal tissue, composed of keratin
## Footnote
Nails and hair are protective structures, while glands secrete substances.
112
Describe the general structure and function of **hair follicles**.
Structures that produce hair, containing the hair root
## Footnote
Hair follicles are involved in hair growth.
113
Identify the location, function, and composition of **arrector pili**.
* Location: Attached to hair follicles
* Function: Causes hair to stand up
* Composition: Smooth muscle
## Footnote
Arrector pili muscles respond to cold or fear.
114
Compare and contrast **sebaceous glands**.
* Location: Associated with hair follicles
* Function: Secretes sebum
* Type & composition of secretions: Oily
## Footnote
Sebaceous glands help lubricate the skin.
115
Compare and contrast **sudoriferous (sweat) glands**.
* Location: Throughout the skin
* Function: Regulates body temperature
* Type & composition of secretions: Watery
## Footnote
Sweat glands help cool the body.
116
Compare and contrast **apocrine glands**.
* Location: Axillary and genital areas
* Function: Secretes sweat with odor
* Type & composition of secretions: Thick, milky
## Footnote
Apocrine glands become active at puberty.
117
Compare and contrast **eccrine glands**.
* Location: Throughout the body
* Function: Regulates body temperature
* Type & composition of secretions: Watery
## Footnote
Eccrine glands are the most common sweat glands.
118
Compare and contrast **ceruminous glands**.
* Location: Ear canal
* Function: Produces earwax
* Type & composition of secretions: Wax-like
## Footnote
Ceruminous glands protect the ear canal.
119
Compare and contrast **mammary glands**.
* Location: Breasts
* Function: Produces milk
* Type & composition of secretions: Nutrient-rich
## Footnote
Mammary glands are specialized sweat glands.
120
Define **core** in body temperature regulation.
The internal temperature of the body
## Footnote
Core temperature is crucial for metabolic processes.
121
Define **shell** in body temperature regulation.
The temperature of the skin and outer layers
## Footnote
Shell temperature can vary significantly from core temperature.
122
Define **heat transfer or exchange agent**.
Substances that facilitate heat exchange in the body
## Footnote
Examples include blood and air.
123
Define **evaporation** in body temperature regulation.
The process of heat loss through sweat evaporation
## Footnote
Evaporation helps cool the body.
124
Describe the role of the **hypothalamus** in temperature regulation.
Acts as the body's thermostat, regulating heat production and loss
## Footnote
The hypothalamus initiates responses to maintain temperature.
125
Describe how the integumentary system functions in **protection**.
* Chemical barrier
* Physical barrier
* Biological barrier
## Footnote
The skin protects against pathogens and environmental damage.
126
Describe how the integumentary system functions in **excretion**.
Eliminates waste products through sweat
## Footnote
The skin plays a role in waste removal.
127
Describe how the integumentary system functions in **body temperature regulation**.
Regulates temperature through sweat and blood flow
## Footnote
The skin helps maintain homeostasis.
128
Describe how the integumentary system functions in **cutaneous sensation**.
* Free dendritic endings
* Merkel discs
* Root hair plexuses
* Encapsulated dendritic endings
* Meissner's corpuscles
* Krause's end bulbs
* Pacinian corpuscles
* Ruffini's corpuscles
## Footnote
These structures provide sensory information.
129
Describe the function of **vitamin D synthesis** in the integumentary system.
The skin synthesizes vitamin D in response to UV light
## Footnote
Vitamin D is essential for calcium absorption.
130
Describe the role of the **blood reservoir** in the integumentary system.
The skin can hold a significant volume of blood
## Footnote
This function helps regulate blood flow and pressure.
131
Review the **three types of cartilage**.
* Hyaline
* Elastic
* Fibrocartilage
## Footnote
Each type has distinct locations and functions.
132
Describe the **five functions of bones**.
* Support
* Protection
* Movement
* Mineral storage
* Blood cell production
## Footnote
These functions are essential for maintaining body structure and function.
133
Identify the location, structure, and function of **spongy bone**.
* Location: Inside bones
* Structure: Lattice-like
* Function: Lightweight support
## Footnote
Spongy bone contains red marrow.
134
Identify the location, structure, and function of **compact bone**.
* Location: Outer layer of bones
* Structure: Dense and solid
* Function: Strength and support
## Footnote
Compact bone is organized into osteons.
135
Describe the classifications of **bones**.
* Long
* Short (including sesamoid)
* Flat (including diploë)
* Irregular
## Footnote
These classifications are based on shape.
136
Identify the location of **blood (hematopoietic) tissue** in bones.
Found in the red marrow cavities of spongy bone
## Footnote
Blood tissue is responsible for blood cell production.
137
Describe the elements of a typical **long bone**.
* Diaphysis
* Medullary cavity
* Yellow bone marrow
* Periosteum
* Epiphysis
* Articular cartilage
## Footnote
These elements contribute to the structure and function of long bones.
138
Identify the function and location of **osteon or Haversian system**.
* Function: Structural unit of compact bone
* Location: Compact bone
## Footnote
Osteons contain blood vessels and nerves.
139
Identify the function and location of **lamellae**.
* Function: Layers of bone matrix
* Location: Surrounding Haversian canals
## Footnote
Lamellae provide strength to bone.
140
Identify the function and location of **Haversian canal**.
* Function: Contains blood vessels and nerves
* Location: Center of osteons
## Footnote
Haversian canals are crucial for bone health.
141
Identify the function and location of **Volkman's canal (perforating canal)**.
* Function: Connects blood vessels between osteons
* Location: Perpendicular to Haversian canals
## Footnote
Volkman's canals facilitate communication within bone.
142
Identify the function and location of **osteocyte**.
* Function: Maintains bone matrix
* Location: Within lacunae
## Footnote
Osteocytes are mature bone cells.
143
Identify the function and location of **lacunae**.
* Function: Houses osteocytes
* Location: Within bone matrix
## Footnote
Lacunae provide space for bone cells.
144
Identify the function and location of **canaliculi**.
* Function: Connects lacunae to Haversian canals
* Location: Tiny channels in bone
## Footnote
Canaliculi facilitate nutrient exchange.
145
Identify the function and location of **interstitial lamellae**.
* Function: Fill spaces between osteons
* Location: Compact bone
## Footnote
Interstitial lamellae contribute to bone strength.
146
Identify the function and location of **circumferential lamellae**.
* Function: Surrounds the entire bone
* Location: Outer layer of compact bone
## Footnote
Circumferential lamellae provide structural support.
147
Define **osteoid**.
The organic component of bone matrix, primarily collagen
## Footnote
Osteoid provides flexibility and tensile strength.
148
Define **hydroxyapatite**.
The inorganic mineral component of bone, primarily calcium phosphate
## Footnote
Hydroxyapatite provides hardness and strength.
149
Correlate bone strength and flexibility to **hydroxyapatite**.
* Structure: Inorganic mineral
* Function: Provides hardness
## Footnote
Hydroxyapatite is crucial for bone rigidity.
150
Correlate bone strength and flexibility to **osteoid**.
* Structure: Organic matrix
* Function: Provides flexibility
## Footnote
Osteoid allows bones to withstand stress.
151
Differentiate between **ossification and osteogenesis**.
* Ossification: Process of bone formation
* Osteogenesis: Development of bone tissue
## Footnote
These terms are often used interchangeably.
152
Differentiate among **osteoblast**.
* Location: Bone surface
* Function: Bone formation
## Footnote
Osteoblasts are responsible for producing new bone.
153
Differentiate among **osteocyte**.
* Location: Within lacunae
* Function: Maintain bone matrix
## Footnote
Osteocytes are mature bone cells.
154
Differentiate among **osteoclast**.
* Location: Bone surface
* Function: Bone resorption
## Footnote
Osteoclasts break down bone tissue.
155
Describe the steps involved in **intramembranous ossification**.
1. Mesenchymal cells cluster and differentiate into osteoblasts
2. Osteoblasts secrete osteoid
3. Osteoid calcifies and forms bone
4. Spongy bone is formed
## Footnote
This process occurs in flat bones.
156
Describe the steps involved in **endochondral ossification**.
1. Hyaline cartilage model forms
2. Cartilage calcifies and chondrocytes die
3. Blood vessels invade and osteoblasts form bone
4. Spongy bone is formed, then remodeled to compact bone
## Footnote
This process occurs in long bones.
157
List the **zones of the epiphyseal plate**.
* Zone of resting cartilage
* Zone of proliferation
* Zone of hypertrophy
* Zone of calcification
* Zone of ossification
## Footnote
These zones are involved in longitudinal bone growth.
158
Identify the factors that cause the **closure of the epiphyseal plate**.
Hormonal changes and cessation of growth
## Footnote
This closure marks the end of bone lengthening.
159
Describe the process of **appositional and longitudinal growth of bone**.
* Appositional: Increase in bone thickness
* Longitudinal: Increase in bone length
## Footnote
Both processes are essential for bone growth.
160
Describe the locations and functions of the following cells in **bone remodeling**.
* Osteoblasts: Build new bone
* Osteocytes: Maintain bone
* Osteoclasts: Resorb bone
## Footnote
These cells work together to remodel bone.
161
Explain how **hormonal controls and physical stress** regulate bone remodeling.
Hormones like parathyroid hormone and calcitonin regulate calcium levels; physical stress stimulates bone formation
## Footnote
These factors ensure bone health and strength.
162
Describe the steps of **fracture repair**.
1. Hematoma formation
2. Fibrocartilaginous callus formation
3. Bony callus formation
4. Bone remodeling
## Footnote
These steps restore bone integrity after a fracture.
163
Describe the following **bone remodeling disorders**.
* Osteoporosis: Decreased bone density
* Osteomalacia: Softening of bones
* Rickets: Vitamin D deficiency in children
## Footnote
These disorders affect bone strength and health.
164
Identify the effects of **aging on the skeletal system**.
Decreased bone density and increased fracture risk
## Footnote
Aging affects bone remodeling and strength.
165
Define **joint or articulation**.
A connection between two or more bones
## Footnote
Joints allow for movement and stability.
166
Define the **structural classification** of joints.
* Fibrous
* Cartilaginous
* Synovial
## Footnote
This classification is based on the material that binds bones together.
167
Define the **functional classification** of joints.
* Synarthroses: Immovable
* Amphiarthroses: Slightly movable
* Diarthroses: Freely movable
## Footnote
This classification is based on the degree of movement allowed.
168
Identify the factors that determine the **degree of movement of a joint**.
* Joint structure
* Ligament strength
* Muscle tone
## Footnote
These factors influence joint stability and mobility.
169
Describe the structure, type of movement, and examples of **fibrous joints**.
* Structure: Connected by dense connective tissue
* Type of movement: Immovable
* Examples: Sutures of the skull
## Footnote
Fibrous joints provide stability.
170
Describe the structure, type of movement, and examples of **cartilaginous joints**.
* Structure: Connected by cartilage
* Type of movement: Slightly movable
* Examples: Intervertebral discs
## Footnote
Cartilaginous joints provide flexibility.
171
Describe the structure, type of movement, and examples of **synovial joints**.
* Structure: Joint cavity filled with synovial fluid
* Type of movement: Freely movable
* Examples: Knee, elbow
## Footnote
Synovial joints allow for a wide range of motion.
172
Describe a **synovial joint**.
* Structure: Joint cavity, articular cartilage, synovial membrane
* Function: Allows for smooth movement
## Footnote
Synovial joints are the most common type of joint.
173
Describe the function of **joint cavity**.
Contains synovial fluid to reduce friction
## Footnote
The joint cavity allows for smooth movement.
174
Describe the function of **articular cartilage**.
Covers the ends of bones to reduce friction
## Footnote
Articular cartilage provides cushioning in joints.
175
Describe the function of **articular capsule**.
Encloses the joint and contains synovial fluid
## Footnote
The articular capsule provides stability to the joint.
176
Describe the function of **synovial membrane**.
Secretes synovial fluid for lubrication
## Footnote
The synovial membrane lines the joint cavity.
177
Describe the function of **synovial fluid**.
Lubricates joints and nourishes cartilage
## Footnote
Synovial fluid reduces friction during movement.
178
Describe the function of **reinforcing ligaments**.
Provide stability and support to joints
## Footnote
Reinforcing ligaments prevent excessive movement.
179
Describe the function of **articular discs (menisci)**.
Cushion and stabilize joints
## Footnote
Articular discs improve fit between bones.
180
Describe the function of **bursae**.
Reduce friction between moving parts
## Footnote
Bursae are fluid-filled sacs that cushion joints.
181
What is the **function** of the **synovial membrane**?
Secretes synovial fluid
## Footnote
The synovial membrane lines the joint capsule and provides lubrication.
182
What is the **function** of **synovial fluid**?
Lubricates joints
## Footnote
Synovial fluid reduces friction between articular cartilages during movement.
183
What are the two types of **reinforcing ligaments**?
* Intrinsic or capsular
* Extracapsular
## Footnote
These ligaments provide stability to synovial joints.
184
What are the three types of **reinforcing ligaments**?
* Intrinsic or capsular
* Extracapsular
* Intracapsular
## Footnote
Each type has a specific role in joint stability.
185
What are **articular discs** also known as?
Menisci
## Footnote
Articular discs improve fit between bones and absorb shock.
186
What is the **function** of **bursae**?
Reduce friction
## Footnote
Bursae are fluid-filled sacs that cushion pressure points between bones and tendons.
187
What is the **function** of a **tendon sheath**?
Protects tendons
## Footnote
Tendon sheaths reduce friction between tendons and surrounding structures.
188
Identify the factors that influence the **stability of synovial joints**.
* Shape of articulating surfaces
* Ligament strength
* Muscle tone
## Footnote
The shape of the joint surfaces is the most significant factor.
189
Define **origin**.
The attachment point of a muscle that remains stationary during contraction
## Footnote
The origin is typically located proximal to the insertion.
190
Define **insertion**.
The attachment point of a muscle that moves during contraction
## Footnote
The insertion is typically located distal to the origin.
191
Identify the range of motion allowed by synovial joints as: **nonaxial, uniaxial, biaxial, multiaxial**.
* Nonaxial: Gliding movements
* Uniaxial: Flexion/extension
* Biaxial: Flexion/extension, abduction/adduction
* Multiaxial: Flexion/extension, abduction/adduction, rotation
## Footnote
These movements apply specifically to synovial joints.
192
Describe **gliding** movement.
Sliding motion between two flat surfaces
## Footnote
Example: Intercarpal joints.
193
Describe **flexion** movement.
Decreases the angle between two body parts
## Footnote
Example: Bending the elbow.
194
Describe **extension** movement.
Increases the angle between two body parts
## Footnote
Example: Straightening the elbow.
195
Describe **hyperextension** movement.
Extension beyond the normal range of motion
## Footnote
Example: Bending the head backward.
196
Describe **abduction** movement.
Movement away from the midline of the body
## Footnote
Example: Raising arms sideways.
197
Describe **adduction** movement.
Movement toward the midline of the body
## Footnote
Example: Lowering arms to the sides.
198
Describe **rotation** movement.
Turning around a central axis
## Footnote
Example: Turning the head side to side.
199
Describe **circumduction** movement.
Circular movement of a limb
## Footnote
Example: Arm circles.
200
Describe **inversion** movement.
Turning the sole of the foot inward
## Footnote
Example: Standing on the outer edge of the foot.
201
Describe **eversion** movement.
Turning the sole of the foot outward
## Footnote
Example: Standing on the inner edge of the foot.
202
Describe **dorsiflexion** movement.
Lifting the foot upwards
## Footnote
Example: Walking on heels.
203
Describe **plantar flexion** movement.
Pointing the toes downward
## Footnote
Example: Standing on tiptoes.
204
Describe **protraction** movement.
Moving a body part forward
## Footnote
Example: Jutting the jaw forward.
205
Describe **retraction** movement.
Moving a body part backward
## Footnote
Example: Pulling the jaw back.
206
Describe **supination** movement.
Turning the palm upward
## Footnote
Example: Holding a bowl of soup.
207
Describe **pronation** movement.
Turning the palm downward
## Footnote
Example: Pouring out soup.
208
Describe **elevation** movement.
Raising a body part
## Footnote
Example: Shrugging shoulders.
209
Describe **depression** movement.
Lowering a body part
## Footnote
Example: Lowering shoulders.
210
Identify the six subtypes of **synovial joints**.
* Plane joints
* Hinge joints
* Pivot joints
* Condyloid joints
* Saddle joints
* Ball-and-socket joints
## Footnote
Each subtype allows for different types of movement.
211
What is **bursitis**?
Inflammation of a bursa
## Footnote
Often caused by repetitive motion or pressure.
212
What is a **sprain**?
Stretching or tearing of ligaments
## Footnote
Commonly occurs in ankles and knees.
213
What is a **strain**?
Stretching or tearing of muscles or tendons
## Footnote
Often results from overexertion.
214
What is a **dislocation**?
Displacement of bones at a joint
## Footnote
Can result from trauma or injury.
215
What is **rheumatoid arthritis**?
Autoimmune disorder affecting joints
## Footnote
Causes inflammation and pain.
216
What is **osteoarthritis**?
Degenerative joint disease
## Footnote
Results from wear and tear on joints.
217
What is **gouty arthritis**?
Inflammation due to uric acid crystals
## Footnote
Often affects the big toe.
218
What are the three overlapping functions of the **nervous system**?
* Sensory input
* Integration
* Motor output
## Footnote
These functions work together to process information and respond.
219
What does the **central nervous system (CNS)** consist of?
* Brain
* Spinal cord
## Footnote
The CNS processes information and coordinates activity.
220
What does the **peripheral nervous system (PNS)** include?
* Sensory or afferent division
* Motor or efferent division
## Footnote
The PNS connects the CNS to the rest of the body.
221
What are the two parts of the **motor or efferent division**?
* Somatic nervous system
* Autonomic nervous system
## Footnote
The autonomic nervous system is further divided into sympathetic and parasympathetic divisions.
222
What is the function of an **astrocyte**?
Support and maintain neurons
## Footnote
Astrocytes are a type of neuroglia in the CNS.
223
What is the function of **microglia**?
Act as immune defense in the CNS
## Footnote
Microglia respond to injury and disease.
224
What is the function of **ependymal cells**?
Line the ventricles of the brain
## Footnote
Ependymal cells help produce and circulate cerebrospinal fluid.
225
What is the function of **oligodendrocytes**?
Form myelin sheaths around CNS axons
## Footnote
Oligodendrocytes increase the speed of nerve impulse conduction.
226
What is the function of a **Schwann cell**?
Form myelin sheaths around PNS axons
## Footnote
Schwann cells are essential for nerve regeneration.
227
What is the function of **satellite cells**?
Support and protect neuron cell bodies in PNS
## Footnote
Satellite cells regulate the environment around neurons.
228
Define **neuron**.
Basic functional unit of the nervous system
## Footnote
Neurons transmit electrical signals throughout the body.
229
What are the three special characteristics of **neurons**?
* Excitability
* Conductivity
* Longevity
## Footnote
Neurons can generate and transmit impulses for long periods.
230
What is the **cell body** of a neuron also known as?
Perikaryon
## Footnote
The cell body contains the nucleus and organelles.
231
What are **Nissl bodies**?
Rough endoplasmic reticulum in neurons
## Footnote
Nissl bodies are involved in protein synthesis.
232
What are **microtubules** in neurons?
Cytoskeletal structures that support the neuron
## Footnote
Microtubules transport materials within the neuron.
233
What are the **neuron processes**?
* Dendrites
* Axon
## Footnote
Dendrites receive signals, while the axon transmits them.
234
What is a **tract**?
Bundle of axons in the CNS
## Footnote
Tracts connect different parts of the CNS.
235
What is a **nerve**?
Bundle of axons in the PNS
## Footnote
Nerves transmit signals to and from the CNS.
236
What is a **dendrite**?
Branching extensions of a neuron that receive signals
## Footnote
Dendrites increase the surface area for receiving inputs.
237
What is an **axon**?
Long projection of a neuron that transmits impulses
## Footnote
The axon ends in axon terminals that release neurotransmitters.
238
What are **axon collaterals**?
Branches of an axon
## Footnote
Axon collaterals allow a single neuron to communicate with multiple targets.
239
What are **telodendria**?
Terminal branches of an axon
## Footnote
Telodendria end in synaptic knobs that release neurotransmitters.
240
What is the **conducting component** of a neuron?
Axon
## Footnote
The axon conducts electrical impulses away from the cell body.
241
What is the **secretory component** of a neuron?
Axon terminals
## Footnote
Axon terminals release neurotransmitters into the synaptic cleft.
242
What is the **axolemma**?
Membrane surrounding the axon
## Footnote
The axolemma is involved in the conduction of action potentials.
243
What is the **myelin sheath**?
Insulating layer around axons
## Footnote
Myelin sheaths increase the speed of nerve impulse conduction.
244
What is the **neurilemma**?
Outer layer of the Schwann cell
## Footnote
The neurilemma aids in the regeneration of damaged axons.
245
What are the **nodes of Ranvier**?
Gaps in the myelin sheath
## Footnote
Nodes of Ranvier facilitate rapid conduction of action potentials.
246
What is a **myelinating cell**?
Cell that forms the myelin sheath
## Footnote
In the CNS, oligodendrocytes myelinate multiple axons.
247
What is **white matter**?
Regions of the CNS with myelinated axons
## Footnote
White matter appears lighter due to the myelin.
248
What is **gray matter**?
Regions of the CNS with unmyelinated axons and cell bodies
## Footnote
Gray matter appears darker and contains neuronal cell bodies.
249
Describe the **structural classification of neurons**.
* Multipolar neurons
* Bipolar neurons
* Unipolar neurons
## Footnote
Each type has a different structure and function.
250
What are **multipolar neurons**?
Neurons with one axon and multiple dendrites
## Footnote
Multipolar neurons are the most common type in the CNS.
251
What are **bipolar neurons**?
Neurons with one axon and one dendrite
## Footnote
Bipolar neurons are found in sensory organs like the retina.
252
What are **unipolar neurons**?
Neurons with a single process that splits into two branches
## Footnote
Unipolar neurons are primarily sensory neurons.
253
Define **afferent/sensory neuron**.
Neurons that carry signals to the CNS
## Footnote
Afferent neurons transmit sensory information.
254
Define **efferent/motor neuron**.
Neurons that carry signals away from the CNS
## Footnote
Efferent neurons stimulate muscles and glands.
255
Define **association/interneuron/internuncial neuron**.
Neurons that connect sensory and motor neurons within the CNS
## Footnote
Interneurons process information and coordinate responses.
256
Define **voltage**.
Electrical potential difference
## Footnote
Voltage is measured in volts and affects neuron activity.
257
Define **potential**.
Stored energy due to charge separation
## Footnote
Potential is crucial for generating action potentials.
258
Define **current**.
Flow of electric charge
## Footnote
Current is measured in amperes and is essential for nerve impulse transmission.
259
Define **resistance**.
Opposition to the flow of electric current
## Footnote
Resistance affects how easily current can flow through a conductor.
260
Compare and contrast **passive or leakage channels** and **active or gated channels**.
* Passive: Always open, allow ions to flow
* Active: Open/close in response to stimuli
## Footnote
Active channels include ligand-gated and voltage-gated channels.
261
Define **electrochemical gradient**.
Difference in ion concentration and charge across a membrane
## Footnote
The electrochemical gradient drives ion movement.
262
Define **resting membrane potential**.
The electrical charge difference across the membrane at rest
## Footnote
Typically around -70 mV in neurons.
263
Define **polarized**.
State of a neuron when it is at rest
## Footnote
A polarized neuron has a negative internal charge relative to the outside.
264
Define **depolarization**.
Reduction in membrane potential
## Footnote
Depolarization occurs when sodium ions enter the neuron.
265
Define **repolarization**.
Return to resting membrane potential after depolarization
## Footnote
Repolarization occurs when potassium ions exit the neuron.
266
Define **hyperpolarization**.
Increase in membrane potential beyond resting state
## Footnote
Hyperpolarization makes the neuron less likely to fire an action potential.
267
What accounts for the **ionic differences** across the cell membrane?
* Selective permeability of the membrane
* Action of ion pumps
## Footnote
Sodium-potassium pumps maintain the resting membrane potential.
268
Define **graded/local potential**.
Small changes in membrane potential that vary in size
## Footnote
Graded potentials can summate to trigger an action potential.
269
Define **action potential**.
Rapid, large change in membrane potential
## Footnote
Action potentials are all-or-none events that propagate along axons.
270
Define **threshold**.
Minimum membrane potential needed to trigger an action potential
## Footnote
Typically around -55 mV in neurons.
271
Explain the steps in the generation of an **action potential**.
* Depolarization
* Repolarization
* Hyperpolarization
## Footnote
Action potentials propagate along unmyelinated fibers through sequential depolarization.
272
Define the **all-or-none phenomenon**.
An action potential either occurs fully or not at all
## Footnote
This principle ensures consistent signal transmission.
273
Define **absolute refractory period**.
Time during which no new action potential can be generated
## Footnote
Occurs during depolarization and repolarization.
274
Define **relative refractory period**.
Time during which a stronger stimulus can generate an action potential
## Footnote
Occurs after the absolute refractory period.
275
List the four factors that determine the **speed of propagation** of a nerve impulse.
* Axon diameter
* Myelination
* Temperature
* Ion concentration
## Footnote
Larger, myelinated axons conduct impulses faster.
276
Define **saltatory conduction**.
Jumping of action potentials between nodes of Ranvier
## Footnote
Saltatory conduction increases conduction velocity in myelinated fibers.
277
What is the general rate of conduction for **myelinated** and **non-myelinated fibers**?
* Myelinated: Fast (up to 120 m/s)
* Non-myelinated: Slow (0.5-2 m/s)
## Footnote
Myelinated fibers are found in areas requiring rapid response.
278
Define **synapse**.
Junction between two neurons or a neuron and an effector
## Footnote
Synapses facilitate communication between cells.
279
Define **presynaptic neuron**.
Neuron that sends the signal
## Footnote
The presynaptic neuron releases neurotransmitters into the synaptic cleft.
280
Define **postsynaptic neuron**.
Neuron that receives the signal
## Footnote
The postsynaptic neuron has receptors for neurotransmitters.
281
Compare and contrast **electrical** and **chemical synapses**.
* Electrical: Direct current flow between cells
* Chemical: Use neurotransmitters to transmit signals
## Footnote
Chemical synapses are more common in the nervous system.
282
What is the role of **Ca++** in a chemical synapse?
Triggers neurotransmitter release
## Footnote
Calcium ions enter the presynaptic terminal, causing synaptic vesicles to fuse with the membrane.
283
What is a **synaptic vesicle**?
Membrane-bound sac containing neurotransmitters
## Footnote
Synaptic vesicles release their contents into the synaptic cleft.
284
What is a **neurotransmitter**?
Chemical messenger that transmits signals across synapses
## Footnote
Examples include acetylcholine and dopamine.
285
What is the **synaptic cleft**?
Space between presynaptic and postsynaptic neurons
## Footnote
Neurotransmitters diffuse across the synaptic cleft to transmit signals.
286
What causes **unidirectional communication** between neurons?
Presence of receptors only on the postsynaptic neuron
## Footnote
This ensures signals travel in one direction.
287
Describe the chain of events that results in **neurotransmitter release**.
* Action potential arrives
* Ca++ influx
* Vesicles fuse with membrane
* Neurotransmitter release
## Footnote
This process is essential for synaptic transmission.
288
Distinguish between **excitatory** and **inhibitory postsynaptic potentials**.
* Excitatory: Depolarizes the postsynaptic membrane
* Inhibitory: Hyperpolarizes the postsynaptic membrane
## Footnote
Excitatory potentials increase the likelihood of an action potential.
289
Define **summation**.
Combining of multiple postsynaptic potentials
## Footnote
Summation determines whether an action potential is generated.
290
Compare and contrast **temporal** and **spatial summation**.
* Temporal: Same synapse firing multiple times
* Spatial: Multiple synapses firing simultaneously
## Footnote
Both types of summation can lead to action potential generation.
291
Define **neurotransmitter**.
Chemical released by neurons to transmit signals
## Footnote
Neurotransmitters play a crucial role in communication between neurons.
292
Describe the chemical class of **acetylcholine**.
Neurotransmitter involved in muscle activation and memory
## Footnote
Acetylcholine is released at neuromuscular junctions.
293
Describe the chemical class of **biogenic amines**.
Neurotransmitters derived from amino acids
## Footnote
Includes catecholamines like dopamine, norepinephrine, and epinephrine.
294
Define the function groups of neurotransmitters: **excitatory** and **inhibitory**.
* Excitatory: Promote action potentials
* Inhibitory: Prevent action potentials
## Footnote
The balance between these groups is essential for proper nervous system function.
295
Define **neuronal pool**.
Group of interconnected neurons that work together
## Footnote
Neuronal pools process specific types of information.
296
Identify the types of **circuits** in neuronal processing.
* Diverging circuits
* Converging circuits
* Reflex circuits
## Footnote
Each type of circuit serves different functions in processing information.
297
What is the **location** of **skeletal muscle**?
Attached to bones
## Footnote
Skeletal muscle is responsible for voluntary movements.
298
What is the **cellular structure** of **skeletal muscle**?
Striated, multinucleated fibers
## Footnote
Skeletal muscle fibers are long and cylindrical.
299
What is the **rate of contraction** for **skeletal muscle**?
Fast
## Footnote
Skeletal muscle can contract rapidly for short periods.
300
What is the **nervous control** of **skeletal muscle**?
Voluntary control via somatic nervous system
## Footnote
Skeletal muscle contractions are consciously controlled.
301
What is the **location** of **smooth muscle**?
Walls of hollow organs
## Footnote
Smooth muscle is found in structures like the intestines and blood vessels.
302
What is the **cellular structure** of **smooth muscle**?
Non-striated, spindle-shaped fibers
## Footnote
Smooth muscle fibers are shorter and have a single nucleus.
303
What is the **rate of contraction** for **smooth muscle**?
Slow and sustained
## Footnote
Smooth muscle contractions are involuntary and can last longer.
304
What is the **nervous control** of **smooth muscle**?
Involuntary control via autonomic nervous system
## Footnote
Smooth muscle contractions are not consciously controlled.
305
What is the **location** of **cardiac muscle**?
Heart wall
## Footnote
Cardiac muscle is responsible for pumping blood.
306
What is the **cellular structure** of **cardiac muscle**?
Striated, branched fibers with intercalated discs
## Footnote
Cardiac muscle fibers are interconnected for synchronized contractions.
307
What is the **rate of contraction** for **cardiac muscle**?
Moderate and rhythmic
## Footnote
Cardiac muscle contracts continuously and rhythmically.
308
What is the **nervous control** of **cardiac muscle**?
Involuntary control via autonomic nervous system
## Footnote
Cardiac muscle contractions are regulated by intrinsic and extrinsic factors.
309
Identify the four general **functions of muscle tissue**.
* Movement
* Posture maintenance
* Joint stabilization
* Heat generation
## Footnote
Muscle tissue plays a vital role in overall body function.
310
Identify and define the four functional **characteristics of muscle tissue**.
* Excitability: Ability to respond to stimuli
* Contractility: Ability to shorten and generate force
* Extensibility: Ability to stretch without damage
* Elasticity: Ability to return to original shape
## Footnote
These characteristics enable muscles to perform their functions.
311
What is the **location** of **epimysium**?
Surrounds entire muscle
## Footnote
Epimysium is a connective tissue layer that protects muscles.
312
What is the **function** of **epimysium**?
Provides structure and support to muscles
## Footnote
Epimysium helps maintain muscle integrity.
313
What is the **location** of **perimysium**?
Surrounds fascicles (bundles of muscle fibers)
## Footnote
Perimysium contains blood vessels and nerves.
314
What is the **function** of **perimysium**?
Provides support and carries blood vessels and nerves
## Footnote
Perimysium helps organize muscle fibers.
315
What is the **location** of **endomysium**?
Surrounds individual muscle fibers
## Footnote
Endomysium provides a supportive environment for muscle cells.
316
What is the **function** of **endomysium**?
Insulates and nourishes muscle fibers
## Footnote
Endomysium allows for efficient communication between muscle fibers.
317
What is the **location** of a **tendon**?
Connects muscle to bone
## Footnote
Tendons transmit the force generated by muscles to bones.
318
What is the **function** of a **tendon**?
Facilitates movement by connecting muscles to bones
## Footnote
Tendons enable the transfer of muscle force to skeletal movement.
319
What is the **location** of an **aponeurosis**?
Flat, sheet-like tendon connecting muscles
## Footnote
Aponeuroses provide a broad attachment for muscles.
320
What is the **function** of an **aponeurosis**?
Connects muscles to other muscles or structures
## Footnote
Aponeuroses help distribute force across a larger area.
321
What is the **location** of **fascia**?
Surrounds muscles and organs
## Footnote
Fascia provides support and compartmentalization.
322
What is the **function** of **fascia**?
Supports and separates muscles and organs
## Footnote
Fascia helps maintain the organization of body structures.
323
Compare and contrast **direct** and **indirect muscle attachments**.
* Direct: Muscle fibers attach directly to bone
* Indirect: Muscle fibers attach to bone via tendons
## Footnote
Indirect attachments allow for greater range of motion.
324
What is the **arrangement of fascicles** in **parallel** muscles?
Fascicles run parallel to the long axis of the muscle
## Footnote
Parallel muscles can shorten significantly.
325
What is the **arrangement of fascicles** in **pennate** muscles?
Fascicles are short and attach at an angle to a central tendon
## Footnote
Pennate muscles can generate more force.
326
What is the **arrangement of fascicles** in **convergent** muscles?
Fascicles converge toward a single insertion point
## Footnote
Convergent muscles can change direction of pull.
327
What is the **arrangement of fascicles** in **circular** muscles?
Fascicles are arranged in concentric rings
## Footnote
Circular muscles control openings and passages.
328
Define **myofilament**.
Contractile proteins within muscle fibers
## Footnote
Myofilaments are responsible for muscle contraction.
329
Define **myofibril**.
Long, thread-like structures in muscle fibers
## Footnote
Myofibrils contain myofilaments and are responsible for muscle contraction.
330
Define **muscle fiber (cell)**.
Single muscle cell
## Footnote
Muscle fibers are multinucleated and specialized for contraction.
331
Define **fascicle**.
Bundle of muscle fibers
## Footnote
Fascicles are surrounded by perimysium.
332
Define **muscle**.
Organ composed of muscle fibers and connective tissue
## Footnote
Muscles are responsible for movement and stability.
333
Define **sarcomere**.
Functional unit of muscle contraction
## Footnote
Sarcomeres are the repeating units within myofibrils.
334
Define **sarcolemma**.
Plasma membrane of a muscle fiber
## Footnote
The sarcolemma conducts electrical impulses.
335
Define **sarcoplasm**.
Cytoplasm of a muscle fiber
## Footnote
Sarcoplasm contains organelles and myofibrils.
336
Define **myoglobin**.
Oxygen-binding protein in muscle fibers
## Footnote
Myoglobin stores oxygen for muscle metabolism.
337
Define **glycosome**.
Storage granule for glycogen in muscle fibers
## Footnote
Glycosomes provide energy during muscle contraction.
338
What produces the visible **striations** in skeletal and cardiac muscle?
Arrangement of myofilaments
## Footnote
Striations are due to alternating light and dark bands.
339
Define **transverse tubules (T-tubules)**.
Extensions of the sarcolemma that penetrate into the muscle fiber
## Footnote
T-tubules facilitate the spread of action potentials.
340
Define **sarcoplasmic reticulum (SR)**.
Specialized endoplasmic reticulum in muscle fibers
## Footnote
SR stores calcium ions necessary for contraction.
341
What is the **T-SR Junction**?
Area where T-tubules and sarcoplasmic reticulum meet
## Footnote
The T-SR junction is crucial for calcium release during contraction.
342
What is the relationship among the **sarcolemma, T-tubules, and sarcoplasmic reticulum**?
T-tubules extend from the sarcolemma and connect to the SR
## Footnote
This relationship allows for rapid transmission of action potentials.
343
Identify the position and function of **actin** in the sarcomere.
Thin filaments that slide during contraction
## Footnote
Actin interacts with myosin to produce muscle contraction.
344
Identify the position and function of **myosin** in the sarcomere.
Thick filaments that pull on actin during contraction
## Footnote
Myosin heads form cross-bridges with actin.
345
Identify the position and function of **tropomyosin** in the sarcomere.
Covers binding sites on actin
## Footnote
Tropomyosin regulates muscle contraction by blocking myosin binding.
346
Identify the position and function of **troponin** in the sarcomere.
Binds calcium ions and moves tropomyosin
## Footnote
Troponin allows myosin to bind to actin when calcium is present.
347
Define **polarized** in terms of neuron and muscle cell membranes.
State of having a difference in charge across the membrane
## Footnote
Polarization is essential for resting membrane potential.
348
Define **depolarized** in terms of neuron and muscle cell membranes.
State of having a reduced charge difference across the membrane
## Footnote
Depolarization occurs during action potential generation.
349
Define **repolarized** in terms of neuron and muscle cell membranes.
State of returning to resting membrane potential
## Footnote
Repolarization restores the original charge difference.
350
Relate the events described in muscle contraction to **impulse conduction**.
Action potentials trigger calcium release, leading to contraction
## Footnote
The sequence of events is crucial for muscle function.
351
What is the role of the **motor unit** in muscle contraction?
Consists of a motor neuron and the muscle fibers it innervates
## Footnote
Motor units coordinate muscle contractions.
352
Define the **all-or-none principle** as it applies to muscle contraction.
A muscle fiber contracts fully or not at all
## Footnote
This principle ensures uniform contraction of muscle fibers.
353
Define **neuromuscular junction**.
Synapse between a motor neuron and a muscle fiber
## Footnote
The neuromuscular junction is where nerve impulses stimulate muscle contraction.
354
What is the **site of production** of **acetylcholine**?
Presynaptic neuron
## Footnote
Acetylcholine is synthesized in the cytoplasm of the neuron.
355
What is the **function** of **acetylcholine**?
Stimulates muscle contraction
## Footnote
Acetylcholine binds to receptors on the muscle fiber membrane.
356
What is the **site of production** of **acetylcholinesterase**?
Presynaptic neuron and postsynaptic membrane
## Footnote
Acetylcholinesterase breaks down acetylcholine in the synaptic cleft.
357
What is the **function** of **acetylcholinesterase**?
Degrades acetylcholine to terminate its action
## Footnote
This prevents continuous stimulation of the muscle fiber.
358
Describe the sequence of events involved in **Excitation-contraction Coupling** of skeletal muscle.
* Action potential arrives at the neuromuscular junction
* Acetylcholine is released
* Calcium ions are released from the SR
* Myosin binds to actin
## Footnote
This sequence leads to muscle contraction.
359
Describe the **Cross Bridge Cycle (Sliding Filament Theory)** of contraction.
* Myosin heads attach to actin
* Power stroke occurs
* Myosin heads detach
* Recovery stroke occurs
## Footnote
This cycle repeats during muscle contraction.
360
Define **motor unit**.
A motor neuron and all the muscle fibers it innervates
## Footnote
Motor units vary in size and function.
361
Draw and define **myogram**.
Graph showing muscle contraction phases
## Footnote
Phases include latent period, contraction period, and relaxation period.
362
What is the **latent period** of a twitch contraction?
Time between stimulus and contraction
## Footnote
The latent period is when excitation-contraction coupling occurs.
363
What is the **contraction period** of a twitch contraction?
Time during which muscle fibers shorten
## Footnote
The contraction period is when force is generated.
364
What is the **relaxation period** of a twitch contraction?
Time during which muscle fibers return to resting state
## Footnote
The relaxation period occurs after contraction.
365
Identify and describe the **refractory periods**.
* Absolute refractory period: No new action potential can occur
* Relative refractory period: A stronger stimulus can trigger an action potential
## Footnote
Refractory periods ensure proper timing of muscle contractions.
366
Compare and contrast **temporal or wave summation**.
* Temporal: Increased frequency of stimulation leads to stronger contractions
* Wave summation: Overlapping contractions lead to increased force
## Footnote
Both result in greater muscle tension.
367
What is **tetanus**?
Sustained muscle contraction without relaxation
## Footnote
Tetanus occurs with high-frequency stimulation.
368
What is **unfused/incomplete tetanus**?
Partial relaxation between contractions
## Footnote
Unfused tetanus results in a wavering contraction.
369
What is **fused/complete tetanus**?
No relaxation between contractions
## Footnote
Fused tetanus results in a smooth, sustained contraction.
370
What is **multiple motor unit summation (recruitment)**?
Activation of additional motor units to increase force
## Footnote
Recruitment allows for graded muscle responses.
371
What is **treppe**?
Gradual increase in muscle contraction strength with repeated stimulation
## Footnote
Treppe occurs when a muscle is stimulated repeatedly after relaxation.
372
Define **cellular respiration**.
Process of converting glucose into ATP
## Footnote
Cellular respiration includes glycolysis, the Krebs cycle, and oxidative phosphorylation.
373
Define **isotonic contraction**.
Muscle changes length while maintaining tension
## Footnote
Examples include lifting weights.
374
Define **concentric contraction**.
Muscle shortens while generating force
## Footnote
Example: Lifting a weight.
375
Define **eccentric contraction**.
Muscle lengthens while generating force
## Footnote
Example: Lowering a weight.
376
Define **isometric contraction**.
Muscle generates force without changing length
## Footnote
Example: Pushing against a wall.
377
Define **muscle tone**.
Sustained partial contraction of muscles
## Footnote
Muscle tone helps maintain posture.
378
Define **atrophy**.
Decrease in muscle size and strength
## Footnote
Atrophy occurs due to disuse or injury.
379
Define **hypertrophy**.
Increase in muscle size and strength
## Footnote
Hypertrophy occurs with resistance training.
380
Define **myoglobin**.
Oxygen-binding protein in muscle tissue
## Footnote
Myoglobin stores oxygen for aerobic respiration.
381
Define **glycosomes**.
Granules that store glycogen in muscle fibers
## Footnote
Glycosomes provide energy during muscle contraction.
382
Define **stress-relaxation response**.
Muscle's ability to adapt to prolonged stretch
## Footnote
This response allows for gradual lengthening of muscles.
383
Identify the **immediate source of energy** for muscle contraction.
Stored ATP
## Footnote
ATP is used directly for muscle contractions.
384
Define **Direct Phosphorylation**.
Rapid ATP production from creatine phosphate
## Footnote
Direct phosphorylation provides quick energy for short bursts of activity.
385
Define **Anaerobic respiration**.
ATP production without oxygen
## Footnote
Anaerobic respiration produces lactic acid as a byproduct.
386
Define **Aerobic respiration**.
ATP production with oxygen
## Footnote
Aerobic respiration is more efficient and produces more ATP.
387
Define **aerobic endurance**.
Ability to sustain prolonged physical activity
## Footnote
Aerobic endurance is improved through cardiovascular training.
388
Define **aerobic threshold**.
Intensity of exercise at which lactic acid begins to accumulate
## Footnote
The aerobic threshold indicates the transition from aerobic to anaerobic metabolism.
389
Define **muscle fatigue**.
Inability to maintain muscle contraction
## Footnote
Muscle fatigue results from prolonged activity and depletion of energy sources.
390
Define **oxygen debt**.
Amount of oxygen required to restore muscle function after exercise
## Footnote
Oxygen debt involves replenishing ATP and clearing lactic acid.
391
Identify the factors affecting the **force of muscle contraction**.
* Number of motor units recruited
* Size of muscle fibers
* Frequency of stimulation
* Muscle length
## Footnote
These factors influence the overall strength of muscle contractions.
392
Identify the factors affecting the **velocity and duration of contraction**.
* Muscle fiber type
* Load on the muscle
* Frequency of stimulation
## Footnote
These factors determine how quickly and how long a muscle can contract.
393
Compare the gross and microscopic anatomy of **smooth muscle fibers** to that of **skeletal muscle fibers**.
* Smooth: Non-striated, involuntary, single nucleus
* Skeletal: Striated, voluntary, multinucleated
## Footnote
The differences reflect their functions in the body.
394
What are the two criteria for classifying **skeletal muscle**?
* Fiber type
* Arrangement of fascicles
## Footnote
These criteria help categorize skeletal muscles based on their function and structure.
395
Compare and contrast **red slow-twitch fibers**, **white fast-twitch fatigable fibers**, and **intermediate fast-twitch fibers**.
* Red slow-twitch: High endurance, aerobic metabolism
* White fast-twitch: Low endurance, anaerobic metabolism
* Intermediate fast-twitch: Moderate endurance and strength
## Footnote
Each fiber type has distinct characteristics suited for different activities.
396
Compare and contrast the **contractile mechanisms** and means of activation of **skeletal** and **smooth muscles**.
* Skeletal: Voluntary, striated, rapid contraction
* Smooth: Involuntary, non-striated, slower contraction
## Footnote
The differences reflect their roles in the body.
397
Compare and contrast **single-unit/syncitial smooth muscle** (visceral muscle) and **multi-unit smooth muscle**.
* Single-unit: Contracts as a unit, found in hollow organs
* Multi-unit: Contracts independently, found in large airways
## Footnote
The differences affect how these muscles function in the body.
