A&P Chapters 17 - 18 (Multiple Choice Questions Only) Flashcards Preview

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Flashcards in A&P Chapters 17 - 18 (Multiple Choice Questions Only) Deck (45)
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1

1. Which of the following is not a general function of muscle tissue?

a. movement

b. protection

c. heat production

d. posture

b. protection

p. 362

Chapter 17: Muscle Contraction

2

2. The skeletal muscle fiber characteristic of excitability directly results in these cells being capable of:

a. responding to nerve signals.

b. shortening.

c. returning to resting length after contracting.

d. producing heat.

a. responding to nerve signals.

p. 362

Chapter 17: Muscle Contraction

3

3. The correct order of arrangement of skeletal muscle cells, from largest to smallest, is:

a. fiber, myofibril, myofilament.

b. myofibril, myofilament, fiber.

c. myofilament, myofibril, fiber.

d. fiber, myofilament, myofibril.

a. fiber, myofibril, myofilament.

p. 364

Chapter 17: Muscle Contraction

4

4. Sarcoplasmic reticulum is:

a. a system of transverse tubules that extend at a right angle to the long axis of the cell.

b. a segment of the myofibril between two successive Z lines.

c. a unique name for the plasma membrane of a muscle fiber.

d. none of the above

d. none of the above

p. 362

Chapter 17: Muscle Contraction

5

5. Which of the following are myofilament proteins?

a. troponin

b. tropomyosin

c. a and b

d. none of the above

c. a and b

p. 366

Chapter 17: Muscle Contraction

6

6. The contractile unit of a myofibril is the:

a. sarcomere.

b. triad.

c. sarcolemma.

d. cross-bridge.

a. sarcomere.

p. 364

Chapter 17: Muscle Contraction

7

7. The chief function of the T tubule is to:

a. provide nutrients to the muscle fiber.

b. allow the fiber to contract.

c. allow the electrical signal to move deep into the cell.

d. allow the generation of new muscle fibers.

c. allow the electrical signal to move deep into the cell.

p. 362

Chapter 17: Muscle Contraction

8

8. Myosin heads are also called:

a. cross-bridges.

b. motor endplates.

c. synapses.

d. motor neurons.

a. cross-bridges.

p. 366

Chapter 17: Muscle Contraction

9

9. During muscle contraction, Ca++ is released from the:

a. synaptic cleft.

b. mitochondria.

c. sarcoplasmic reticulum.

d. sarcoplasm.

c. sarcoplasmic reticulum.

p. 368

Chapter 17: Muscle Contraction

10

10. The region of a muscle fiber where a motor neuron connects to the muscle fiber is called the:

a. synaptic vesicle.

b. motor endplate.

c. H band.

d. none of the above.

b. motor endplate.

p. 366

Chapter 17: Muscle Contraction

11

21. The principal component(s) of a motor unit is/are:

a. one somatic motor neuron.

b. the muscle fibers supplied by a somatic motor neuron.

c. none of the above.

d. both a and b.

d. both a and b.

p. 374
Chapter 17: Muscle Contraction

12

22. The staircase phenomenon is also known as:

a. tetanus.

b. electromyography.

c. wave summation.

d. treppe.

d. treppe.

p. 375

Chapter 17: Muscle Contraction

13

23. Skeletal muscles are innervated by:

a. somatic motor neurons.

b. autonomic motor neurons.

c. both a and b.

d. internal stimulation.

a. somatic motor neurons.

p. 374


Chapter 17: Muscle Contraction

14

24. Which of the following statements concerning isometric contractions is true?

a. The length of the muscle changes.

b. Muscle tension decreases.

c. Joint movements are swift.

d. Muscle length remains constant.

d. Muscle length remains constant.

p. 380

Chapter 17: Muscle Contraction

15

25. Physiologic muscle fatigue is caused by:

a. relative lack of ATP.

b. oxygen debt.

c. lack of will.

d. none of the above.

a. relative lack of ATP.

p. 377

Chapter 17: Muscle Contraction

16

26. Increase in muscle size is called:

a. hyperplasia.

b. atrophy.

c. hypertrophy.

d. treppe.

c. hypertrophy.

p. 378

Chapter 17: Muscle Contraction

17

27. Endurance training is also called:

a. isometrics.

b. hypertrophy.

c. aerobic training.

d. anaerobic training.

c. aerobic training.

p. 378

Chapter 17: Muscle Contraction

18

49. When a muscle does not shorten and no movement results, the contraction is:

a. isometric.

b. isotonic.

c. twitch.

d. tetanic.

a. isometric.

p. 380

Chapter 17: Muscle Contraction

19

50. Pushing against a wall is an example of which type of contraction?

a. isotonic

b. isometric

c. twitch

d. tetanic

b. isometric

p. 380


Chapter 17: Muscle Contraction

20

51. Prolonged inactivity causes muscles to shrink in mass, a condition called:

a. hypertrophy.

b. disuse atrophy.

c. paralysis.

d. muscle fatigue.

b. disuse atrophy.

p. 378

Chapter 17: Muscle Contraction

21

52. Muscle fibers usually contract to about _______% of their starting length.

a. 50

b. 60

c. 70

d. 80

d. 80

p. 369

Chapter 17: Muscle Contraction

22

53. Which statement is true of smooth muscle?

a. It lines the walls of many hollow organs.

b. It is striated.

c. It is voluntary.

d. There are many T tubules throughout smooth muscle.

a. It lines the walls of many hollow organs.

p. 381

Chapter 17: Muscle Contraction

23

17. Which of the following is/are classified as nerve fibers?

a. axon

b. dendrites

c. both a and b

d. none of the above

c. both a and b

p. 399

Chapter 18: Nervous System Cells

24

18. Which of the following conduct impulses toward the cell body?

a. axons

b. dendrites

c. Nissl bodies

d. none of the above

b. dendrites

p. 399

Chapter 18: Nervous System Cells

25

19. A neuron with one axon and several dendrites is a:

a. multipolar neuron.

b. unipolar neuron.

c. bipolar neuron.

d. none of the above

a. multipolar neuron.

p. 401


Chapter 18: Nervous System Cells

26

20. Which type of neuron lies entirely within the CNS?

a. afferent

b. efferent

c. interneuron

d. none of the above

c. interneuron

p. 402

Chapter 18: Nervous System Cells

27

21. Which sequence best represents the course of an impulse over a reflex arc?

a. receptor, synapse, sensory neuron, motor neuron, effector

b. effector, sensory neuron, synapse, motor neuron, receptor

c. receptor, motor neuron, synapse, sensory neuron, effector

d. receptor, sensory neuron, interneuron, motor neuron, effector

d. receptor, sensory neuron, interneuron, motor neuron, effector

p. 402

Chapter 18: Nervous System Cells

28

22. A complete nerve, consisting of numerous fascicles and their blood supply, is held together by a fibrous coat called the:

a. endoneurium.

b. perineurium.

c. epineurium.

d. fascicles.

c. epineurium.

p. 404

Chapter 18: Nervous System Cells

29

23. Small, distinct regions of gray matter within the CNS are usually called:

a. white matter.

b. nuclei.

c. ganglia.

d. fascicles.

b. nuclei.

p. 404

Chapter 18: Nervous System Cells

30

24. Nerves that contain mostly efferent fibers are called:

a. sensory nerves.

b. motor nerves.

c. mixed nerves.

d. Schwann nerves.

b. motor nerves.

p. 404

Chapter 18: Nervous System Cells