Human Body and Movement Practice Quiz (26 questions)

1. Which substance makes up the largest listed proportion of a human cell?

A. Water, at 75%

B. Proteins, at 15%

C. Lipids, at 3%

D. RNA, at 2%

Answer: (A)

Explanation

Water accounts for 75% of the listed cell composition, the largest proportion. Proteins are the next largest listed component at 15%, not the largest.

2. What distinguishes the organization of DNA in eukaryotic cells from that in prokaryotic cells?

A. Eukaryotic DNA is organized within a cell wall, while prokaryotic DNA is enclosed in chromosomes.

B. Eukaryotic DNA is absent, while prokaryotic DNA is organized into chromosomes within a nuclear membrane.

C. Eukaryotic DNA is organized into chromosomes within a nuclear membrane, while prokaryotic DNA is not organized in a nucleus.

D. Eukaryotic DNA is free in the cytoplasm, while prokaryotic DNA is enclosed within a nuclear membrane.

Answer: (C)

Explanation

Eukaryotic cells have DNA organized into chromosomes within a nuclear membrane, whereas prokaryotic cells lack DNA organized in a nucleus. The related confusion is to describe the distinction simply as presence or absence of a nucleus, rather than the stated organization of DNA.

3. In the levels of body organization, what is a tissue?

A. A collection of body parts working together for a specific function

B. A single cell containing several specialized structures

C. A group of organs performing a shared physiological action

D. A group of cells with a common origin

Answer: (D)

Explanation

A tissue is defined as a group of cells with a common origin. A collection of body parts working together for a function describes an apparatus, not a tissue.

4. Which structures make up the dorsal cavity, and what do they contain?

A. The thoracic cavity contains the brain, and the spinal cavity contains the heart.

B. The cranial cavity contains the spinal cord, and the spinal cavity contains the brain.

C. The cranial cavity contains the lungs, and the abdominal cavity contains the spinal cord.

D. The cranial cavity contains the brain, and the spinal cavity contains the spinal cord.

Answer: (D)

Explanation

The dorsal cavity comprises the cranial cavity, which contains the brain, and the spinal cavity, which contains the spinal cord. The brain and spinal cord are not assigned to the opposite cavities.

5. Which set of structures is located in the thoracic cavity, above the diaphragm?

A. The stomach, liver, spleen, and pancreas

B. The brain, spinal cord, stomach, and intestines

C. The lungs, heart, trachea, and major blood vessels

D. The colon, sigmoid colon, rectum, and reproductive organs

Answer: (C)

Explanation

The thoracic cavity lies above the diaphragm and contains the lungs, heart, trachea, and major blood vessels. The stomach and liver are associated with the abdominal cavity, which lies below the diaphragm.

6. Which organs are located in the abdominal cavity below the diaphragm?

A. The colon, sigmoid colon, rectum, and spinal cord

B. The stomach, liver, spleen, pancreas, and intestines

C. The lungs, heart, trachea, and major blood vessels

D. The brain, spinal cord, and reproductive organs

Answer: (B)

Explanation

The abdominal cavity lies below the diaphragm and contains the stomach, liver, spleen, pancreas, and intestines. The lungs and heart instead lie in the thoracic cavity above the diaphragm.

7. A structure is farther from the trunk and toward the body's midline than another structure; which terms describe these positions?

A. Distal and lateral

B. Distal and medial

C. Proximal and lateral

D. Proximal and medial

Answer: (B)

Explanation

Distal means farther from the trunk, while medial means toward the body's midline. Proximal refers to being nearer the trunk, and lateral refers to being toward either side.

8. How does the skeletal system help produce movement?

A. It moves the body by storing minerals in its bones.

B. It works with joints and contracting muscles to move the body.

C. It produces nerve impulses that directly move the body.

D. It contracts independently of muscles to move the body.

Answer: (B)

Explanation

The skeleton works with joints and contracting muscles to enable movement. Mineral storage is another function of bones, but it does not itself describe how movement occurs.

9. Which components of blood are produced by bone marrow?

A. Erythrocytes, connective tissue, and muscle cells

B. Plasma, antibodies, and hormones

C. Neurons, neuroglia, and platelets

D. Erythrocytes, leukocytes, and platelets

Answer: (D)

Explanation

Bone marrow produces blood cells, including erythrocytes, leukocytes, and platelets. Plasma, antibodies, and hormones are not the listed products of bone marrow.

10. Which classification correctly pairs bone shapes with examples?

A. Long—femur; short—carpals; flat—skull bones; irregular—vertebrae

B. Long—vertebrae; short—skull bones; flat—carpals; irregular—femur

C. Long—skull bones; short—vertebrae; flat—femur; irregular—carpals

D. Long—carpals; short—femur; flat—vertebrae; irregular—skull bones

Answer: (A)

Explanation

The femur, carpals, skull bones, and vertebrae are examples of long, short, flat, and irregular bones, respectively. Carpals are short bones, not long bones; long bones are characterized by length.

11. What is a joint in the musculoskeletal system?

A. A band of fibers connecting a muscle to a bone

B. A cartilage structure that cushions the ends of bones

C. A connection between bones or skeletal segments

D. A contractile organ that produces movement

Answer: (C)

Explanation

A joint is the connection between bones or skeletal segments. A tendon connects muscle to bone, rather than defining a joint.

12. A joint allows extensive movement; which classification best describes it?

A. A cartilaginous connection

B. A diarthrosis or synovial joint

C. A synarthrosis

D. An amphiarthrosis

Answer: (B)

Explanation

Diarthroses, also called synovial joints, allow extensive movement. Synarthroses are immovable, while amphiarthroses allow little movement.

13. Which structure is a dense connective-fiber band that connects bones and helps stabilize a joint?

A. A joint capsule

B. A ligament

C. A muscle

D. A tendon

Answer: (B)

Explanation

A ligament connects bone to bone and helps stabilize a joint. A tendon is the related structure that connects muscle to bone.

14. During movement, which structure connects a muscle to a bone?

A. A tendon

B. A synovial joint

C. A ligament

D. A cartilage pad

Answer: (A)

Explanation

A tendon is a white fibrous band or cord connecting muscle to bone. A ligament instead connects bones and stabilizes a joint.

15. Which condition is identified as a muscle disorder?

A. Fibromyalgia

B. Osteomyelitis

C. Gout

D. Osteoporosis

Answer: (A)

Explanation

Fibromyalgia is listed among muscle disorders, along with dystrophy, contractures, and tears. Osteoporosis is a bone disorder, while gout is classified as a joint disorder.

16. A patient is diagnosed with gout; which musculoskeletal category does this diagnosis belong to?

A. Tendon disorder

B. Joint disorder

C. Bone disorder

D. Muscle disorder

Answer: (B)

Explanation

Gout is included among the named joint disorders. Osteoporosis, a plausible alternative, is a bone disorder.

17. Which set of nutrients is recommended to support skeletal health and growth?

A. Calcium, iron, vitamin C, and vitamin K

B. Calcium, phosphorus, vitamin D, and vitamin A

C. Phosphorus, potassium, vitamin C, and vitamin E

D. Iron, magnesium, vitamin A, and vitamin B12

Answer: (B)

Explanation

A balanced diet with calcium, phosphorus, vitamins D and A is recommended for skeletal health and growth. The other sets replace one or more of these nutrients with nutrients not included in that recommendation.

18. How does sunlight contribute to vitamin D production?

A. It enables the digestive system to convert dietary vitamin A into vitamin D.

B. It enables substances in the skin, including sterols, to be converted into vitamin D.

C. It supplies vitamin D directly by transferring it through the skin.

D. It causes the bones to convert calcium and phosphorus into vitamin D.

Answer: (B)

Explanation

Sunlight enables substances in the skin, including sterols, to be converted into vitamin D. It does not directly supply vitamin D or convert vitamin A into it.

19. What best defines immobility syndrome?

A. A reduction or loss of daily activity ability caused by deteriorating movement functions

B. A reduction in endurance caused by a short-term respiratory infection

C. A temporary loss of balance caused by changes in the inner ear

D. A decline in memory that prevents a person from recognizing familiar people

Answer: (A)

Explanation

Immobility syndrome involves reduced or lost ability to perform daily activities because movement functions have deteriorated. A balance problem may affect mobility, but it does not capture the syndrome’s broader effect on daily activities.

20. Which combination of findings characterizes immobility syndrome?

A. Reduced appetite, persistent joint pain, and loss of visual and hearing reflexes

B. Reduced exercise tolerance, persistent muscle weakness, and loss of automatic movements and postural reflexes

C. Increased exercise tolerance, intermittent muscle weakness, and preserved postural reflexes

D. Improved muscle strength, increased coordination, and frequent involuntary movements

Answer: (B)

Explanation

The characteristic findings include reduced exercise tolerance, persistent muscle weakness, and loss of automatic movements and postural reflexes. Joint pain or sensory changes may affect a person, but they are not the defining combination described here.

21. A person can perform normal daily activities independently but has limited mobility. Which degree of immobility best fits this description?

A. Severe immobility, because the person is confined to bed

B. Complete immobility, because all self-care activities require assistance

C. Moderate immobility, because some assistance is required for activities

D. Mild immobility, because autonomy for normal activities is preserved

Answer: (D)

Explanation

Mild immobility preserves autonomy for normal activities, even when mobility is limited. Moderate immobility makes activities difficult and requires some assistance, which is not the situation described.

22. Which group of consequences can result from prolonged immobility in bed?

A. Muscle atrophy, constipation, pressure ulcers, depression, and social isolation

B. Enhanced autonomy, improved circulation, and reduced risk of contractures

C. Increased exercise tolerance, reduced respiratory effort, and improved postural reflexes

D. Improved muscle tone, faster digestion, stronger bones, and greater social engagement

Answer: (A)

Explanation

Bed immobility can cause physical problems such as atrophy, constipation, and pressure ulcers, as well as psychological and social problems including depression and isolation. Improved muscle tone and autonomy are potential benefits of exercise, not consequences of immobility.

23. Before moving a person or object, which preparation best supports safe body mechanics?

A. Stand on an uneven surface, keep both feet parallel, and raise the shoulders

B. Clear the area, widen the stance, place one foot forward, and bend the knees

C. Keep the feet close together, lock the knees, and lean the trunk toward the load

D. Move the object first, then widen the stance and adjust the working area

Answer: (B)

Explanation

Safe preparation includes clearing the area, widening the stance, placing one foot slightly forward, and lowering the center of gravity by bending the knees. Locking the knees and leaning toward the load does not provide the recommended stable posture.

24. When lifting an object from the floor, how should the body be positioned to reduce strain on the back?

A. Keep the legs straight and twist the trunk while raising the object

B. Bend the back and keep the legs straight so the back muscles perform the lifting

C. Round the back and pull the object upward with the shoulders

D. Bend the legs and keep the back straight so the leg muscles perform the lifting

Answer: (D)

Explanation

Bending the legs while keeping the back straight shifts the lifting work toward the leg muscles. Bending the back instead places more of the work on the back muscles and increases strain.

25. A caregiver must turn while supporting a patient, and the task may be unsafe for one person. What is the best approach?

A. Turn the feet and trunk together quickly, using greater force if the patient shifts

B. Turn the feet before the trunk, maintain alignment, and seek help or technical assistance if needed

C. Twist the trunk before moving the feet, and continue alone if the patient is cooperative

D. Lean the trunk sideways, keep the feet fixed, and ask for help after the movement

Answer: (B)

Explanation

Safe movement involves turning the feet before the trunk, maintaining body alignment, and obtaining help or technical assistance when the task could endanger the patient or caregiver. Twisting the trunk with the feet fixed compromises alignment and does not address the risk of performing the task alone.

26. Which description correctly distinguishes Trendelenburg from anti-Trendelenburg positioning?

A. Trendelenburg places the feet below the head; anti-Trendelenburg places the head below the feet

B. Both positions raise the head above the feet, but use different degrees of elevation

C. Both positions place the head and feet at the same level but tilt the trunk sideways

D. Trendelenburg places the head below the feet; anti-Trendelenburg places the feet below the head

Answer: (D)

Explanation

Trendelenburg positioning places the head lower than the feet, whereas anti-Trendelenburg, or Morestin, places the feet lower than the head. Reversing these orientations confuses the defining difference between the positions.