Question 1

Which property of muscle tissue allows it to respond to a stimulus by generating an electrical impulse?

Accepted Answer

Excitability

Question 2

A patient is diagnosed with a disorder that prevents the breakdown of acetylcholine at the neuromuscular junction. What is the most likely effect on their muscle contractions?

Accepted Answer

Muscle contractions will be prolonged and possibly lead to spasms.

Question 3

Which structure directly covers an entire skeletal muscle?

Accepted Answer

Epimysium

Question 4

During muscle contraction, which event occurs immediately after calcium ions bind to troponin?

Accepted Answer

Tropomyosin moves away from actin's active sites.

Question 5

A muscle fiber is stimulated repeatedly before it can fully relax, resulting in a sustained contraction with no relaxation phase. What is this phenomenon called?

Accepted Answer

Complete tetanus

Question 6

Which equation best represents the conversion of ADP to ATP using creatine phosphate during muscle contraction?

Accepted Answer

$$\mathrm{ADP} + \mathrm{CP} \rightarrow \mathrm{ATP} + \mathrm{C}$$

Question 7

Which type of muscle fiber is most likely to be found in muscles used for endurance activities such as marathon running?

Accepted Answer

Slow fibers

Question 8

A muscle is contracting against a load that does not move, and its length does not change. What type of contraction is occurring?

Accepted Answer

Isometric contraction

Question 9

Which of the following best explains why cardiac muscle cannot produce tetanic contractions?

Accepted Answer

Cardiac muscle twitches do not exhibit wave summation.

Question 10

What is the primary function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

To store and release calcium ions

Question 11

A muscle fiber is unable to contract due to a buildup of hydrogen ions and exhaustion of energy resources. What is this condition called?

Accepted Answer

Fatigue

Question 12

Which of the following is TRUE regarding smooth muscle contraction?

Accepted Answer

Smooth muscle contraction is initiated by calcium binding to calmodulin.

Question 13

Which of the following best describes the relationship between load and speed of contraction in skeletal muscle?

Accepted Answer

Load and speed are inversely related.

Question 14

A muscle fiber is at its optimal resting length. What effect does this have on the tension produced during contraction?

Accepted Answer

Tension is maximal because cross-bridge formation is optimal.

Question 15

Which of the following is a function unique to skeletal muscle tissue compared to cardiac and smooth muscle?

Accepted Answer

Maintaining body temperature

Question 16

Which of the following best describes the process of excitation–contraction coupling in skeletal muscle?

Accepted Answer

Action potential triggers release of Ca$$^{2+}$$ from the sarcoplasmic reticulum.

Question 17

Which of the following muscle fiber types is most resistant to fatigue and contains abundant myoglobin?

Accepted Answer

Slow fibers

Question 18

A muscle's ability to return to its original length after being stretched is known as:

Accepted Answer

Elasticity

Question 19

Which of the following is TRUE about the recovery period after intense muscle activity?

Accepted Answer

The recovery period involves restoring pre-exertion conditions and repaying oxygen debt.

Question 20

Which of the following statements about muscle fiber recruitment is correct?

Accepted Answer

Recruiting more motor units increases muscle tension.

Chapter 10: Muscle Tissue – Structure, Function, and Physiology

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