Question 1

Which of the following statements best describes the difference in control between skeletal, cardiac, and smooth muscle tissue?

Accepted Answer

Skeletal muscle is voluntary, while both cardiac and smooth muscle are involuntary.

Question 2

A patient is experiencing muscle fatigue after strenuous exercise. Which of the following is NOT a likely contributing factor?

Accepted Answer

Increased ATP supply

Question 3

Which connective tissue layer directly surrounds a single muscle fiber?

Accepted Answer

Endomysium

Question 4

During the sliding filament theory of muscle contraction, what is the role of calcium ions (Ca$$^{2+}$$)?

Accepted Answer

They bind to regulatory proteins on actin, exposing myosin-binding sites.

Question 5

Which muscle type is characterized by branching cells, striations, and intercalated discs?

Accepted Answer

Cardiac muscle

Question 6

What is the primary energy source used directly for muscle contraction?

Accepted Answer

ATP

Question 7

Which process produces the greatest net gain of ATP per glucose molecule during muscle activity?

Accepted Answer

Aerobic respiration ($$32$$ ATP per glucose)

Question 8

A muscle is contracting but not shortening, as when pushing against an immovable object. What type of contraction is this?

Accepted Answer

Isometric contraction

Question 9

Which of the following best describes the sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Nerve impulse → Ca$$^{2+}$$ influx → ACh release → Na$$^+$$ influx → Action potential

Question 10

Which of the following is true regarding the banding pattern of a sarcomere during contraction?

Accepted Answer

The H zone disappears as actin and myosin filaments overlap.

Question 11

Which muscle type is most likely to be found in the walls of hollow visceral organs such as the stomach and urinary bladder?

Accepted Answer

Smooth muscle

Question 12

What is the function of acetylcholinesterase (AChE) at the neuromuscular junction?

Accepted Answer

It breaks down acetylcholine, ending muscle contraction.

Question 13

Which of the following best explains why muscle tone is important?

Accepted Answer

It keeps muscles firm, healthy, and ready for action.

Question 14

A marathon runner relies primarily on which pathway for ATP regeneration during a race?

Accepted Answer

Aerobic respiration

Question 15

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

Accepted Answer

Presence of intercalated discs

Question 16

Which of the following best describes the 'all-or-none' law of muscle fiber contraction?

Accepted Answer

A muscle fiber contracts to its fullest when stimulated adequately.

Question 17

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

Accepted Answer

Pumping blood throughout the body

Question 18

Which of the following best explains why lactic acid accumulates in muscles during intense exercise?

Accepted Answer

Oxygen is insufficient, so pyruvic acid is converted to lactic acid during anaerobic glycolysis.

Question 19

Which of the following is true regarding the speed of contraction among muscle types?

Accepted Answer

Skeletal muscle contracts slow to fast, cardiac muscle contracts at a moderate rate, and smooth muscle contracts very slowly.

Question 20

Which of the following best describes the role of the sarcoplasmic reticulum in muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for contraction.

The Muscular System: Structure, Function, and Physiology

Study Guide - Practice Questions