Question 1

Which of the following best describes the appearance and control of cardiac muscle tissue?

Accepted Answer

Striated, one nucleus, involuntary

Question 2

During the contraction cycle in skeletal muscle, which protein directly binds to calcium ions to initiate contraction?

Accepted Answer

Troponin

Question 3

A patient is experiencing muscle fatigue after prolonged exercise. Which of the following is NOT a typical cause of muscle fatigue?

Accepted Answer

Excessive release of acetylcholine at the neuromuscular junction

Question 4

Which equation correctly represents the conversion of lactate to pyruvate during recovery from exercise?

Accepted Answer

$$\mathrm{C_3H_6O_3} \rightarrow \mathrm{C_3H_4O_3} + 2\mathrm{H^+}$$

Question 5

Which of the following statements about the neuromuscular junction (NMJ) is correct?

Accepted Answer

Voltage-gated calcium channels open, leading to neurotransmitter release

Question 6

A muscle is stimulated repeatedly before it has fully relaxed, resulting in a stronger contraction. What is this phenomenon called?

Accepted Answer

Wave summation

Question 7

Which type of skeletal muscle fiber is most resistant to fatigue and is primarily used during endurance activities?

Accepted Answer

Slow oxidative fiber

Question 8

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

Accepted Answer

Creatine phosphate

Question 9

Which structural protein in the sarcomere is responsible for elasticity and helps the muscle return to its resting length after contraction?

Accepted Answer

Titin

Question 10

A person is unable to maintain force of muscle contraction during prolonged activity. Which process is most likely impaired?

Accepted Answer

Release of Ca$$^{2+}$$ from the sarcoplasmic reticulum

Question 11

Which of the following best explains why you continue to breathe heavily after exercise?

Accepted Answer

To replenish oxygen debt and restore ATP stores

Question 12

Which of the following is true regarding smooth muscle tissue?

Accepted Answer

It can stretch and shorten to a greater extent than skeletal muscle

Question 13

Which process describes the increase in the number of active motor units to produce a stronger muscle contraction?

Accepted Answer

Motor unit recruitment

Question 14

Which of the following is a regulatory protein involved in the contraction of skeletal muscle?

Accepted Answer

Troponin

Question 15

What is the effect of aging on skeletal muscle tissue between ages 50-80?

Accepted Answer

Muscle tissue is replaced by fibrous connective and adipose tissue

Question 16

Which of the following best describes an isometric muscle contraction?

Accepted Answer

Muscle contracts but does not change length

Question 17

Which event at the neuromuscular junction directly leads to the release of Ca$$^{2+}$$ from the sarcoplasmic reticulum?

Accepted Answer

Binding of neurotransmitter to ligand-gated Na$$^+$$ channels

Question 18

Which of the following is a contractile protein found in the sarcomere?

Accepted Answer

Actin

Question 19

A muscle fiber is unable to contract after stimulation. Which of the following is the most likely cause?

Accepted Answer

Insufficient release of acetylcholine at the neuromuscular junction

Question 20

Which equation best represents the breakdown of creatine phosphate to regenerate ATP in muscle cells?

Accepted Answer

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

Muscular Tissue: Structure, Function, and Physiology (Chapter 10 Study Notes)

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