CH 4.1 Epitheleal Flashcards

(39 cards)

1
Q

What are the four types of tissue and their main function

A

Epithelial - Provides covering

Connective - Provides support

Muscle - Provides movement

Nervous - Provides control

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2
Q
A
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3
Q

What are the four main characteristics of epithelial tissue?

A

Polarity, specialized contacts, support by connective tissue, avascular but innervated, high regeneration rate

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4
Q

What does polarity mean in epithelial tissue?

A

Cells have apical, lateral, and basal surfaces

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5
Q

What is the basement membrane made of?

A

Basal lamina and reticular lamina

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6
Q

What are the two layers of the basal lamina?

A

Lamina lucida and lamina densa

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7
Q

What is the function of the basement membrane?

A

Anchors epithelium, acts as filter, guides regeneration

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8
Q

Why are epithelial tissues avascular?

A

They lack blood vessels and get nutrients by diffusion

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9
Q

What are tight junctions?

A

Junctions that seal cells to prevent leakage

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10
Q

What are desmosomes?

A

Anchoring junctions that resist mechanical stress

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11
Q

What are hemidesmosomes?

A

Junctions that anchor cells to the basement membrane

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12
Q

What are gap junctions?

A

Junctions that allow cell-to-cell communication

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13
Q

How are epithelial tissues classified?

A

By number of layers and cell shape

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14
Q

What are the three epithelial cell shapes?

A

Squamous, cuboidal, columnar

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15
Q

What is simple epithelium?

A

One layer of cells

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16
Q

What is stratified epithelium?

A

Two or more layers of cells

17
Q

What is pseudostratified epithelium?

A

Appears layered but all cells touch basement membrane

18
Q

What is the function of simple squamous epithelium?

A

Rapid diffusion and filtration

19
Q

Where is simple squamous epithelium found?

A

Alveoli, endothelium, serous membranes

20
Q

What is the function of simple cuboidal epithelium?

A

Secretion and absorption

21
Q

Where is simple cuboidal epithelium found?

A

Kidney tubules and glands

22
Q

What is the function of simple columnar epithelium?

A

Absorption and secretion

23
Q

What specializations may simple columnar cells have?

A

Microvilli or cilia

24
Q

What is the function of pseudostratified ciliated columnar epithelium?

A

Secretes and moves mucus

25
Where is pseudostratified epithelium found?
Upper respiratory tract
26
What is the function of stratified squamous epithelium?
Protection from abrasion
27
What is keratinized stratified squamous epithelium?
Epithelium with dead, keratin-filled cells
28
Where is keratinized epithelium found?
Epidermis of skin
29
Where is nonkeratinized stratified squamous found?
Mouth, esophagus, vagina
30
Where is stratified cuboidal epithelium found?
Sweat glands
31
Where is stratified columnar epithelium found?
Male urethra and some glands
32
What is transitional epithelium specialized for?
Stretching
33
Where is transitional epithelium found?
Urinary bladder and ureters
34
What is the function of microvilli?
Increase surface area for absorption
35
What is the function of cilia?
Move substances across the cell surface
36
What is the difference between endocrine and exocrine glands?
Endocrine secrete into blood, exocrine use ducts
37
What is merocrine secretion?
Secretion by exocytosis
38
What is apocrine secretion?
Secretion by pinching off cell apex
39
What is holocrine secretion?
Secretion by cell rupture