Anatomy Basics

Question 1

List the ELEVEN systems of the human body.

Answer 1

1. Integumentary
2. Muscular
3. Skeletal
4. Cardiovascular
5. Respiratory
6. Digestive
7. Urinary
8. Nervous
9. Endocrine
10. Reproductive
11. Lymphatic

These systems work together to ensure the body functions properly.

Question 2

Which system is responsible for movement?

Answer 2

The muscular system

Muscles contract and relax to enable movement. This is important for patient care because it directly affects the patient’s ability to move, breathe, eat, and maintain circulation, which are all fundamental aspects of their health and recovery.

Question 3

How does the integumentary system protect the body?

Answer 3

• Acts as a barrier against microbes
• Regulates temperature
• Contains sensory organs

The skin, hair, and nails form this system. Here are the three most common changes you will see in this system as a patient ages:

• Skin Thinning and Fragility: The skin becomes thinner, drier, and loses elasticity (it doesn’t snap back as quickly). This makes the patient much more prone to skin tears and pressure ulcers (bedsores).
• Slower Healing: The body’s ability to repair itself slows down, meaning cuts, scrapes, and wounds take much longer to heal.
• Temperature Sensitivity: The sweat glands and fat layer under the skin decrease, making it harder for the patient to regulate their body temperature. They often feel colder and are at higher risk for heat-related illnesses.

Question 4

List THREE functions of the Musculoskeletal System (bones and muscles).

Answer 4

1. Provides support
2. Protects vital organs
3. Helps with movement

Here are three main functions of the Musculoskeletal System (bones and muscles):

• Support: The bones act as the body’s framework or scaffolding, giving the body its shape and holding it upright.
• Movement: The muscles pull on the bones to allow you to walk, run, lift, and perform all daily activities.
• Protection: The bones protect soft, vital organs, such as the skull protecting the brain and the ribs protecting the heart and lungs.

Question 5

True or False:

The heart is divided into four chambers.

Answer 5

True

The heart has two atria and two ventricles. Understanding the anatomy of the heart is essential because the heart is the pump for the entire Cardiovascular System, circulating blood that carries oxygen and nutrients to every cell in the body.

Since the heart’s function directly affects vital signs like pulse and blood pressure, recognizing its basic structure helps nursing assistants accurately monitor and report changes that could signal a life-threatening emergency.

Question 6

Define:

Orthostatic Hypotension

Answer 6

A sudden drop in blood pressure when standing up.

This occurs due to reduced arterial elasticity. When helping a resident get out of bed, first have them sit on the edge for a few minutes.

Ask them, ‘Are you dizzy?’ If they say no, then you can help them stand up. This slow change prevents them from getting dizzy and falling from a sudden drop in blood pressure.

Question 7

Which system processes food for nourishment?

Answer 7

The digestive system

This system breaks down food and absorbs nutrients.

Your Role as a Nursing Assistant:

• Prevent Constipation: Encourage fluids, fiber (if allowed), and mobility (walking). Report any lack of bowel movements to the nurse.
• Encourage Eating: Make mealtime pleasant, ensure the resident has their dentures and glasses, and follow any special diet instructions (like thickened liquids) carefully to prevent aspiration.
• Positioning: Always ensure the resident is sitting upright (at least 90 degrees) while eating and for at least 30 minutes afterward to help the food move down safely.

Question 8

What is the role of the small intestine in digestion?

Answer 8

Absorbs nutrients from food.

It is the main site of nutrient absorption. The small intestine is the primary site where nutrients and fluids are absorbed into the bloodstream, making it critical for a patient’s nutrition and hydration status.

Since many medications are also absorbed here, any condition affecting the small intestine, such as diarrhea or a blockage, can seriously impact the patient’s ability to get the full benefit of their food and medicine.

Therefore, a nursing assistant’s role involves closely monitoring and accurately reporting changes in a patient’s appetite, bowel movements, and fluid intake to ensure this vital absorption process is working correctly.

Question 9

How does the liver aid in digestion?

Answer 9

It produces bile to break down fats.

Bile is a yellowish-green fluid made by the liver and stored in the gallbladder. Its main job is to break down fats in the small intestine so the body can absorb them.

Now, let’s talk about Emesis. This is the medical term for vomiting. When a patient has emesis, it is a sign that their digestive system is reacting strongly to something, and it can cause a loss of fluids and important salts.

The Nursing Assistant’s Role: Your job is critical when a patient has emesis. You must quickly provide a basin, help the patient turn their head to prevent choking (aspiration), measure the amount of vomit, note its color and consistency (like if it looks like bile), and immediately report all of this information to the nurse. This quick action protects the patient and provides the nurse with vital information for treatment.

Question 10

How does the digestive system change with age?

Answer 10

• Decreased saliva production
• Slower digestion

When a resident has decreased saliva production and slower digestion, the nursing assistant’s role is focused on safety, comfort, and nutrition.

Safety (Decreased Saliva): You must ensure the resident is safe from choking. This means making sure they are sitting fully upright while eating, offering sips of water between bites, and ensuring they are wearing their dentures (if applicable) to chew food properly.

Comfort (Slower Digestion): You help prevent constipation by encouraging fluid intake throughout the day and promoting mobility (walking or moving) as much as possible, which helps the digestive tract move food along.

Nutrition: You make mealtimes pleasant and appealing, as decreased taste can lead to poor appetite. You must also accurately record food and fluid intake and report any significant changes to the nurse.

Question 11

What is the function of the kidneys?

Answer 11

They filter waste and excess fluid from the blood.

Here are three brief signs of healthy kidney function that a CNA should look for:

• Clear, Pale Yellow Urine: Healthy kidneys filter waste and excess water, producing urine that is typically a light, straw-like yellow color. Dark, concentrated, or cloudy urine can be a sign of dehydration or a problem.
• Steady, Predictable Output: A healthy person produces a steady amount of urine throughout the day. A sudden, large decrease in output (oliguria) or an inability to urinate (anuria) is a serious sign that the kidneys may be failing or that the patient is severely dehydrated.
• No Pain or Burning: Healthy urination should not be painful. The absence of complaints about burning, urgency, or frequent small amounts of urine suggests the kidneys and bladder are working without infection or irritation.

Your role is to accurately measure and record the patient’s fluid intake and output (I&O) and immediately report any significant changes in color, amount, or complaints of pain to the nurse.

Question 12

What are the main organs of the nervous system?

Answer 12

The Nervous System is the body’s control center, and its main organs are:

• the brain
• spinal cord
• nerves (Specialized nerve cells that send and receive signals)

Brain: The central computer that controls thought, memory, emotion, movement, and all body functions.

Spinal Cord: The main highway of nerves that runs down the back, connecting the brain to the rest of the body.

Nerves: The “wires” that branch out from the spinal cord to carry messages between the brain and every part of the body.

For a CNA, understanding these parts helps you recognize that changes in a patient’s behavior, movement, or sensation (like numbness or tingling) are all signs of a change in the nervous system that must be reported immediately.

Question 13

What are the main reproductive organs in males?

Answer 13

• Testes
• Penis
• Prostate gland

The primary organs of the male reproductive system are the testes (which produce sperm and hormones), the penis (used for urination and reproduction), and the prostate gland (which produces fluid for semen).

As a CNA, your role involves providing respectful and private hygiene care for these areas.

Question 14

What is the effect of aging on the reproductive system?

Answer 14

• Women stop menstruating
• Men produce fewer sperm

This matters to nursing assistants for two main reasons:

• Emotional and Behavioral Changes: Hormonal shifts during menopause and the male decline can cause mood swings, hot flashes, sleep disturbances, and changes in energy. Understanding this helps you provide compassionate and patient care for residents experiencing these often uncomfortable and emotional changes.
• Physical Care and Comfort: Menopause can lead to changes in the urinary system (like increased frequency or incontinence) and the integumentary system (like drier skin). Knowing this helps you anticipate needs, provide extra hygiene care, and ensure the resident’s comfort and dignity.

Question 15

What are the main organs of the female reproductive system, and what are its primary functions?

Answer 15

Main Organs:

• Ovaries
• Uterus
• Vagina

Primary Functions:

• Produce sex cells
• Enable reproduction

The main organs of the female reproductive system are the ovaries (which produce eggs and hormones), the uterus (where a baby develops), and the vagina (the birth canal).

Your role as a CNA includes providing respectful and private hygiene care, especially during menstruation or when assisting with perineal care.

Question 16

What is the main function of the cardiovascular system?

Answer 16

To circulate blood, delivering oxygen and nutrients.

When you take a resident’s pulse, you are feeling the pressure wave of blood being pushed through an artery (like the one in the wrist).

Arteries carry blood away from the heart under high pressure, which is why you can feel the beat (pulsation).

Veins carry blood back to the heart under low pressure and do not have a pulse.

Question 17

How does aging affect the cardiovascular system?

Answer 17

Blood vessels lose elasticity, increasing blood pressure.

This can lead to heart disease and circulation issues. Here is an overview of the 10 Most Common Heart and Blood Vessel Diseases.

Question 18

Which blood vessels carry oxygenated blood?

Answer 18

Arteries

Arteries are the “delivery trucks” of the body, carrying oxygen-rich blood away from the heart to all the organs and tissues.

Because they are under high pressure from the heart’s pump, you can feel the beat (the pulse) when you press an artery against a bone, like in the wrist.

Clinical Insight: When arteries get clogged (like in Coronary Artery Disease), the body doesn’t get enough oxygen. Your job is to watch for signs like chest pain, shortness of breath, or cold, pale feet, and report them immediately, as they mean the arteries are struggling to deliver blood.

Question 19

How does the skin regulate body temperature?

Answer 19

By sweating and adjusting blood vessel diameter.

Sweat glands cool the body by producing sweat. Heavy sweating is called diaphoresis (a sign of being too hot or distressed). The opposite is shivering, which is the body trying to warm up.

Both are signs of a temperature problem (hyperthermia or hypothermia) that must be reported.

Question 20

List TWO skin changes due to aging.

Answer 20

1. Decreased elasticity
2. Reduced oil production

The skin of an elderly resident is fragile—it is thinner, drier, and heals more slowly. Your hands are the most important tools for protecting it. To learn more about how to care for aging skin, click here.

Question 21

Which muscle type is under voluntary control?

Answer 21

Skeletal muscles

Voluntary Movement is simply any movement a person chooses to do, like walking, reaching for a glass of water, or turning their head.

For a nursing assistant, this matters because:

• Independence: Encouraging a resident to use their voluntary movement (even if it’s slow) helps them keep their strength and independence.
• Safety: You must always check if a resident can move voluntarily before assisting them, as this tells you how much help they need to move safely.
• Reporting: A sudden loss of voluntary movement (like a paralyzed arm) is a critical sign of a problem with the Nervous System (like a stroke) and must be reported immediately.

Question 22

What are involuntary muscles?

Answer 22

Muscles that contract automatically without conscious control.

Involuntary Muscles are the muscles that work automatically without a person having to think about them.

For a nursing assistant, this matters because:

• Life Support: Involuntary muscles are responsible for all the essential, life-sustaining functions, such as the heart muscle pumping blood and the smooth muscles in the digestive tract moving food.
• Internal Health: When a resident has a problem with an involuntary muscle (like a weak heart or slow digestion), it affects their overall health. Your job is to monitor the outward signs of these internal problems, such as swelling (weak heart) or constipation (slow digestion).
• Medication Effects: Many medications residents take are designed to help these involuntary muscles work better (like blood pressure medicine). Your accurate reporting of vital signs and bowel movements helps the nurse know if these medications are working.

Question 23

Fill in the blank:

The _____ is the body’s largest organ.

Answer 23

skin

The skin is the body’s largest organ, and this matters to a nursing assistant because:

• First Line of Defense: As the largest organ, the skin is the primary barrier against germs. Your job is to keep it clean and intact through proper bathing and hygiene to prevent infections.
• Indicator of Health: The skin is a window to the resident’s internal health. Changes in color (pale, blue), temperature (hot, cold), or moisture (sweaty, dry) are often the first signs of a serious problem with the heart, lungs, or circulation that you must report immediately.
• Vulnerability: Because it is so large and exposed, the skin is highly vulnerable to damage like pressure injuries (bedsores). Your constant vigilance in turning, repositioning, and keeping the skin dry is the most important care you provide.

Question 24

What is the function of sensory receptors in the skin?

Answer 24

They detect:

• Touch
• Pain
• Temperature

The skin is filled with sensory receptors—tiny nerve endings that allow us to feel touch, pressure, pain, heat, and cold.

This matters to a nursing assistant in several key ways:

• Pain and Comfort: These receptors are how a resident feels pain. You must be gentle during all care (bathing, turning, dressing) to avoid causing pain, and you must report any complaints of pain immediately, as it is the body’s signal that something is wrong.
• Safety and Burns: The receptors for heat and cold protect the resident from injury. Because these receptors can become less sensitive with age, you must always check the temperature of bath water and food yourself before giving it to the resident to prevent accidental burns.
• Pressure Awareness: Receptors for pressure tell a person when they need to shift position. In residents who are immobile, these receptors may not work well, or the resident may not be able to move. This is why you must turn and reposition them regularly—to relieve the pressure that their own body can no longer sense or respond to.

Question 25

Which is the **largest bone** in the human body?

Answer 25

The femur ## Footnote The **femur** (thigh bone) is the largest and strongest bone, and it is the main structural support for standing and walking. This matters to a nursing assistant and fall prevention because: * **Fracture Risk**: Because the femur is so large, a fracture (break) is a major, life-threatening injury that requires surgery and a long recovery. The most common break is a hip fracture, which often happens when a resident falls. * **Weight-Bearing**: The femur is the primary bone that bears the body's weight. If a resident has a weak femur (due to osteoporosis) or weak muscles around it, their ability to stand is compromised, making a fall highly likely. **Your Role**: Your use of a gait belt and your safe transfer techniques are directly aimed at protecting the femur and hip joint. By preventing the fall, you prevent the fracture of the largest, most critical bone for mobility, ensuring the resident can remain active and avoid a major health crisis.

Question 26

# Fill in the blank: The **smallest bones** in the body are called \_\_\_\_\_\_\_.

Answer 26

ossicles ## Footnote The **ossicles** are the three tiny bones in the middle ear (the hammer, anvil, and stirrup). Their job is to amplify sound vibrations and send them to the inner ear, which is how we hear. This matters to a nursing assistant because: * **Hearing Loss**: As people age, the ossicles can become stiff, which is a common cause of age-related hearing loss. This means the resident may not hear you, the call light, or important safety instructions. * **Communication**: When caring for a resident with hearing loss, you must slow down, face the resident so they can read your lips, speak clearly and in a lower pitch (high-pitched sounds are often lost first), and reduce background noise. * **Safety and Dignity**: Never assume a resident is confused or ignoring you; they may simply not have heard you. Your role is to ensure they can communicate their needs and understand their care plan, which protects their safety and maintains their dignity.

Question 27

# Define: Ligaments

Answer 27

Connective tissues that **link bones together**. ## Footnote **Ligaments** are strong, flexible bands of tissue that connect bone to bone, providing stability to joints like the knee and shoulder. This matters to a nursing assistant because: * **Joint Protection**: Ligaments are easily stretched or torn if a joint is moved too far or too fast. When you are performing Range of Motion (ROM) exercises, you must move the joint slowly and gently, never forcing it past the point of resistance or pain, to protect these ligaments. * **Fall Risk**: Weakened ligaments (due to age or injury) make joints unstable, which is a major contributor to a resident's fall risk. * **Reporting**: If a resident falls or twists a joint, the ligaments may be damaged (a sprain). You must immediately report any swelling, pain, or inability to move a joint, as this indicates a potential ligament injury that requires medical attention. Your gentle handling and careful transfers are essential for protecting the stability that ligaments provide.

Question 28

# True or False: The heart pumps blood **through veins** to the body.

Answer 28

False ## Footnote **Veins** return blood to the heart, and **Arteries** carry it away - to the body. This matters to a nursing assistant because: * **Vein Function (Return)**: Veins rely on muscle movement to push blood back to the heart. When a resident is immobile, blood can pool in the veins, increasing the risk of blood clots (DVT). Your role is to encourage ambulation and perform range-of-motion exercises to help the veins do their job. * **Artery Function (Delivery)**: Arteries deliver oxygen. If a resident has poor circulation (like in their feet), it means the arteries are not delivering enough oxygen. Your role is to check for signs like cold, pale, or blue skin and report them immediately. * **Overall Health**: You are constantly monitoring the efficiency of this system through vital signs and observation. Any change in the delivery (arteries) or return (veins) of blood is a critical sign of a problem that requires immediate reporting.

Question 29

How do veins **differ from arteries**?

Answer 29

Veins have **thinner walls**. ## Footnote Arteries vs. Veins: The Simple Difference * **Arteries**: Carry blood AWAY from the heart. They are under high pressure from the heart's pump. This is why you can feel a **pulse** in them. * **Veins**: Carry blood BACK to the heart. They are under low pressure and do not have a pulse.

Question 30

# Define: Capillaries

Answer 30

Tiny blood vessels that **connect the arteries to the veins**. ## Footnote **Capillaries** are the body's smallest blood vessels where oxygen is dropped off. **Capillary refill** is a quick check to see if blood returns to the fingers in under 2 seconds. If a resident has **cold hands or feet**, it means poor circulation. Your role is to report a slow refill and keep the resident warm, but never use heating pads on cold feet, as poor circulation prevents them from feeling a burn.

Question 31

What is the function of **platelets**?

Answer 31

Help blood clot. ## Footnote **Platelets** are tiny parts of the blood that act like emergency workers to stop bleeding. When a resident gets a cut, platelets rush to the site and form a clot to plug the hole. If a resident is on **blood thinners**, their platelets cannot clot as easily, so you must be extra careful to prevent cuts and report any unusual bruising or bleeding immediately.

Question 32

What is the function of **white blood cells**?

Answer 32

Fight infections and **protect against disease**. ## Footnote **White Blood Cells** are the body's soldiers or police force in the Lymphatic System. Their job is to fight off germs and protect against disease. When a resident has an infection, the body makes more white blood cells, which can cause a fever or swollen lymph nodes (glands in the neck or armpit). Your role is to watch for and report signs of infection like fever, redness, swelling, or unusual drainage, as these mean the white blood cells are actively fighting a battle.

Question 33

What is the function of **red blood cells**?

Answer 33

**Carry oxygen** throughout the body. ## Footnote **Red Blood Cells** are the delivery vehicles in the blood. They contain hemoglobin, which is like a magnet that picks up oxygen in the lungs and drops it off to every cell in the body. **CNA Insight**: When a resident has too few red blood cells (a condition called anemia), they can't deliver enough oxygen. This causes them to look pale, feel very tired (fatigued), and be short of breath. Your role is to recognize these signs of low oxygen delivery and report them immediately to the nurse, as the resident may need rest or treatment.

Question 34

List the FOUR **components of the urinary** system?

Answer 34

1. Kidneys 2. Ureters 3. Bladder 4. Urethra ## Footnote The four main components of the Urinary System are: * **Kidneys**: The two main filters that clean the blood and produce urine. * **Ureters**: The tubes that carry urine from the kidneys down to the bladder. * **Bladder**: The muscular sac that stores the urine until it is ready to be released. * **Urethra**: The tube that carries urine from the bladder out of the body. **CNA Insight**: Your job is to monitor the output from this system (urine) and report any changes in color, amount, or frequency to the nurse.

Question 35

What is the effect of **aging** on the **urinary system**?

Answer 35

* Decreased bladder capacity * Bladder muscle weakness ## Footnote Here are the three most common changes you will see: * **Decreased Bladder Capacity**: The bladder muscle becomes less elastic and can't hold as much urine. This leads to urinary frequency (needing to go to the bathroom more often). * **Weaker Bladder Muscles**: The muscles that control the bladder weaken, making it harder to hold urine. This is the main cause of urinary incontinence (the inability to control urination). * **Incomplete Emptying**: The bladder may not empty completely when the resident voids. This leftover urine can become a breeding ground for bacteria, leading to a higher risk of Urinary Tract Infections (UTIs). **CNA Role**: Your role is to assist with frequent toileting (every 2 hours is often a good schedule), ensure good perineal hygiene to prevent UTIs, and never make a resident feel embarrassed about incontinence. You must also report any signs of a UTI (confusion, fever, or strong-smelling urine) immediately.

Question 36

Which organ is responsible for **producing insulin**?

Answer 36

The pancreas ## Footnote **Pancreas and Insulin**: The pancreas makes Insulin, which is the key that lets sugar (glucose) move from the blood into the body's cells for energy. This keeps the blood sugar level balanced. **High/Low Sugar**: * Hyperglycemia means the blood sugar is too high (too much sugar in the blood). * Hypoglycemia means the blood sugar is too low (not enough sugar in the blood). **CNA Insight**: If a resident has Diabetes, their blood sugar can swing between these two dangerous states. You must report signs of Hyperglycemia (extreme thirst, frequent urination) and especially Hypoglycemia (shakiness, sweating, confusion) to the nurse immediately, as low blood sugar is a life-threatening emergency.

Question 37

# Fill in the blanks: The \_\_\_\_\_\_\_ \_\_\_\_\_ **carry eggs** from the ovaries to the uterus.

Answer 37

fallopian tubes ## Footnote The **Fallopian Tubes** are part of the female reproductive system. They are two narrow tubes that connect the ovaries (where the eggs are stored) to the uterus (the womb). Their job is to carry the egg from the ovary to the uterus, which is needed for reproduction.

Question 38

Which organ **stores bile**?

Answer 38

The gallbladder ## Footnote **Bile's Job**: Bile is a digestive juice made by the liver. Its main job is to break down fats in the small intestine so the body can absorb them. **Gallbladder's Job**: The Gallbladder is a small organ that acts like a storage tank for bile, releasing it into the small intestine when you eat a fatty meal. **CNA Insight**: If a resident has a problem with their gallbladder (like gallstones), they may have severe pain, especially after eating fatty foods. You must report any complaints of sudden, sharp pain in the upper right side of the abdomen, especially if it happens after a meal, as this could indicate a gallbladder attack. You should also be aware of any dietary restrictions the resident has to avoid triggering this pain.

Question 39

What is the purpose of the **spinal cord**?

Answer 39

To **transmit signals** between the brain and body. ## Footnote The spinal cord is the main highway of the Nervous System. Its purpose is to: * **Transmits Signals**: It is the primary pathway for carrying messages between the brain and the rest of the body. It sends signals from the brain to control movement, and it sends signals from the body (like pain or touch) up to the brain. * **Reflexes**: It controls rapid, involuntary actions called reflexes (like quickly pulling your hand away from a hot stove) without the brain even having to think about it. **CNA Insight**: Any injury to the spinal cord can result in a loss of movement or sensation below the injury site. Your care must be extremely gentle and careful when moving a resident with a known or suspected spinal cord injury.

Question 40

# Define: Metabolism

Answer 40

The **rate** at which the body **converts food into energy**. ## Footnote **Metabolism** is the process where the body converts food into energy. Think of it as the body's engine running. This matters to a nursing assistant because: * **Energy and Weight**: A resident's metabolism determines how quickly they burn calories. A slow metabolism (common with age) means they gain weight more easily and may feel less energetic. * **Temperature**: Metabolism produces heat. When a resident is sick or has a fever, their metabolism is working overtime to fight the infection. **CNA Role**: You support a healthy metabolism by ensuring the resident gets proper nutrition (the right fuel) and encouraging activity (to keep the engine running). Any sudden, unexplained weight loss or gain is a sign of a metabolic problem (like a thyroid issue) that you must report to the nurse.

Question 41

# Fill in the blank: The \_\_\_\_\_\_ gland **controls metabolism**.

Answer 41

thyroid ## Footnote The **Thyroid Gland** is in the front of the neck and controls the body's metabolism (how fast the body uses energy). If it's too slow (**Hypothyroidism**), the resident may be cold and gain weight. If it's too fast (**Hyperthyroidism**), they may be hot and lose weight. Your role is to report any sudden changes in weight, temperature, or energy level to the nurse.

Question 42

What role do the **adrenal glands** play?

Answer 42

* Control salt, potassium, and water balance * Influence heart function ## Footnote The **Adrenal Glands** sit on top of the kidneys and produce hormones like **adrenaline** to help the body handle stress (the "fight or flight" response). When a resident is stressed or in pain, their heart rate and blood pressure go up. Your role is to provide a calm environment and report pain quickly to reduce the stress on their body.

Question 43

Which organ is responsible for **filtering toxins** from the blood?

Answer 43

The liver ## Footnote The **Liver** is the large organ responsible for filtering toxins (like alcohol and medications) from the blood and breaking them down. It also makes bile to help digest fats. Because the liver processes medications, your role is to accurately report any signs of side effects or **jaundice** (yellowing of the skin/eyes) to the nurse.

Question 44

List TWO functions of the **nervous system**.

Answer 44

1. Coordinates body responses 2. Processes sensory information ## Footnote **Coordination and Communication**: It controls all body functions and sends messages between the brain and the rest of the body. **Sensing the World**: It allows the body to sense and react to changes, such as feeling pain, seeing, hearing, and balancing. **CNA Insight**: Any sudden change in a resident's ability to move, speak, or feel is a sign of a problem with the nervous system and must be reported immediately.

Question 45

# True or False: The nervous system consists of the **brain**, **spinal cord**, and **nerves**.

Answer 45

True ## Footnote **Brain**: Controls everything the resident thinks, feels, and does. **Spinal Cord**: The main message highway. **Nerves**: The wires that carry the messages. **CNA Insight**: When you see a change in a resident's thinking (confusion), movement (weakness), or feeling (numbness), you are seeing a problem with one of these three parts. Your job is to be the first to notice and report these changes.

Question 46

What is the main function of the **respiratory system**?

Answer 46

To **exchange gases**, bringing in oxygen and expelling carbon dioxide. ## Footnote The main function of the Respiratory System is Gas Exchange. This means it: * **Brings in Oxygen**: Takes oxygen from the air and puts it into the blood. * **Removes Waste**: Takes carbon dioxide (a waste gas) from the blood and releases it into the air. **CNA Insight**: If a resident is having trouble breathing (shortness of breath, rapid breathing, or making strange noises), it means this system is struggling to get oxygen to the body. Your role is to elevate the head of the bed (to help the lungs expand) and report the change immediately.

Question 47

# True or False: The lungs **remove oxygen** from the body.

Answer 47

False ## Footnote The lungs remove **carbon dioxide** (a waste gas) from the body. The lungs' main job is to bring **oxygen** into the body. This is the critical function of the Respiratory System.

Question 48

What is the function of the **alveoli**?

Answer 48

Exchange **oxygen and carbon dioxide**. ## Footnote Alveoli are the tiny air sacs in the lungs where oxygen is picked up. To keep these sacs open and prevent pneumonia, residents may use an Incentive Spirometer. Your role is to remind the resident to use it as ordered, ensuring they are sitting up straight and inhaling slowly and deeply to clear their lungs.

Question 49

What does the **endocrine system regulate**?

Answer 49

* Hormones * Bodily functions ## Footnote The Endocrine System regulates many of the body's processes using chemical messengers called hormones. It primarily regulates: * **Metabolism**: How the body uses food for energy (controlled by the Thyroid and Pancreas). * **Growth and Development**: How the body grows and changes (especially during puberty). * **Mood and Sleep**: It helps control emotions, stress levels, and sleep cycles.

Question 50

Which is the **master gland** of the endocrine system?

Answer 50

The pituitary gland ## Footnote The **Pituitary Gland** is the "Master Gland" located at the base of the brain. It produces hormones that control almost all other glands (like the thyroid). Because it controls so many body functions, any major, unexplained change in a resident's body (like extreme fatigue or weight change) must be reported, as it could be a sign of a problem with this Master Gland.

Question 51

Which gland regulates **sleep-wake cycles**?

Answer 51

The pineal gland ## Footnote The **Pineal Gland** is a tiny gland in the brain that produces the hormone **melatonin**. Melatonin controls the body's sleep-wake cycle (circadian rhythm). Your role is to help residents maintain a regular sleep schedule by keeping their room dark and quiet at night and opening the curtains in the morning to help this gland work correctly. Report any severe sleep problems to the nurse.

Question 52

What is the purpose of the **synovial fluid in joints**?

Answer 52

Reduces friction and **cushions movement**. ## Footnote **Synovial Fluid** is a thick, slippery liquid found inside joints (like the knee). Its purpose is to lubricate the joint and act as a shock absorber, allowing the bones to move smoothly without grinding against each other. When assisting a resident with movement, always be gentle to protect the joint and the fluid within it.

Question 53

What happens to **bone density with age**?

Answer 53

**It decreases**, increasing the risk of fractures. ## Footnote Bone density decreases with age. This means the bones lose minerals, become thinner, and are more porous (full of tiny holes). This condition is called **osteoporosis**. **CNA Insight**: * **Increased Fracture Risk**: Because the bones are weaker, the resident is at a much higher risk for fractures (breaks), especially in the hip, spine, and wrist. * **Fall Prevention is Critical**: Your role in fall prevention is the single most important thing you do to protect a resident with decreased bone density. A simple fall that a younger person would walk away from can cause a life-threatening break in an elderly resident.