Question 1

Which of the following is NOT a function of muscle tissue?

Accepted Answer

Synthesis of neurotransmitters

Question 2

Which property of muscle tissue allows it to return to its original length after being stretched?

Accepted Answer

Elasticity

Question 3

A muscle cell is also known as a:

Accepted Answer

Muscle fiber

Question 4

Which connective tissue sheath surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 5

What is the main function of the sarcoplasmic reticulum in skeletal muscle cells?

Accepted Answer

Storing calcium ions ($$\mathrm{Ca$$^{2+}$$})$$

Question 6

Which protein covers the myosin binding sites on actin when the muscle is at rest?

Accepted Answer

Tropomyosin

Question 7

During muscle contraction, what event directly triggers the power stroke?

Accepted Answer

Release of ADP from the myosin head

Question 8

Which of the following best describes the 'all-or-none' principle in muscle physiology?

Accepted Answer

A muscle fiber contracts to its full extent or not at all when stimulated

Question 9

Which of the following is TRUE regarding the difference between isotonic and isometric contractions?

Accepted Answer

Isotonic contractions change muscle length and move a load

Question 10

A patient is exposed to curare, a poison that binds to acetylcholine receptors at the neuromuscular junction. What is the most likely effect?

Accepted Answer

Muscle paralysis due to failure of excitation

Question 11

Which muscle cell type is best adapted for endurance activities such as marathon running?

Accepted Answer

Slow oxidative

Question 12

What is the primary source of ATP during the first 15 seconds of intense muscle activity?

Accepted Answer

Creatine phosphate

Question 13

Which of the following best explains why rigor mortis occurs after death?

Accepted Answer

Lack of ATP prevents detachment of myosin from actin

Question 14

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

Intercalated discs

Question 15

A muscle cell is unable to contract even when stimulated. Which of the following is LEAST likely to be a cause?

Accepted Answer

High oxygen availability

Question 16

Which of the following best describes the role of myoglobin in muscle cells?

Accepted Answer

Binds oxygen for aerobic respiration

Question 17

Which of the following is TRUE about smooth muscle contraction?

Accepted Answer

It is slow, synchronized, and resistant to fatigue

Question 18

During the contraction cycle, what must occur for the myosin head to detach from actin?

Accepted Answer

Binding of ATP to the myosin head

Question 19

Which of the following best describes the effect of aerobic exercise on skeletal muscle?

Accepted Answer

Increases capillaries, mitochondria, and myoglobin in muscle cells

Question 20

Which of the following is the correct sequence of events in excitation-contraction coupling in skeletal muscle?

Accepted Answer

ACh release → Sarcolemma depolarization → $$\mathrm{Ca$$^{2+}$$}$$ release → Cross-bridge formation

The Muscular System: Structure, Function, and Physiology

Study Guide - Practice Questions