Question 1

Which of the following best describes the primary function of cardiac muscle tissue?

Accepted Answer

Pump blood throughout the body

Question 2

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

Accepted Answer

Troponin

Question 3

What is the role of creatine phosphate in muscle metabolism?

Accepted Answer

It provides a rapid source of ATP by donating a phosphate group to ADP.

Question 4

Which event at the neuromuscular junction directly triggers the release of acetylcholine (ACh) into the synaptic cleft?

Accepted Answer

Influx of calcium ions through voltage-gated channels

Question 5

A patient is unable to maintain muscle contraction during prolonged activity. Which of the following is NOT a likely cause of muscle fatigue?

Accepted Answer

Excessive release of acetylcholine at the neuromuscular junction

Question 6

Which equation correctly represents the conversion of creatine phosphate and ADP to ATP in muscle cells?

Accepted Answer

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

Question 7

Which type of muscle contraction occurs when muscle tension is constant but the muscle length changes?

Accepted Answer

Tonic contraction

Question 8

What is the main structural difference between skeletal and smooth muscle tissue?

Accepted Answer

Skeletal muscle is multinucleated and striated, while smooth muscle has one nucleus and no striations.

Question 9

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

Accepted Answer

To replenish oxygen debt and restore metabolic balance

Question 10

A muscle fiber is unable to contract after repeated stimulation. Which process is most likely impaired?

Accepted Answer

Release of calcium ions from the sarcoplasmic reticulum

Question 11

Which of the following is true regarding the length-tension relationship in skeletal muscle?

Accepted Answer

Maximum force is generated when sarcomeres are at optimal resting length.

Question 12

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

Accepted Answer

Slow oxidative fibers

Question 13

What is the primary function of intercalated discs in cardiac muscle tissue?

Accepted Answer

To allow rapid transmission of electrical signals between cells

Question 14

Which process describes the increase in muscle fiber size due to resistance training?

Accepted Answer

Hypertrophy

Question 15

Which of the following best describes the sliding filament mechanism?

Accepted Answer

Myosin pulls on actin, causing the thin filament to slide inward

Question 16

Which of the following is a regulatory protein in the sarcomere?

Accepted Answer

Troponin

Question 17

A muscle exhibits a small amount of tension even when at rest. What is this phenomenon called?

Accepted Answer

Muscle tone

Question 18

Which of the following is true about smooth muscle compared to skeletal muscle?

Accepted Answer

Smooth muscle can stretch and shorten to a greater extent than skeletal muscle.

Question 19

Which of the following best explains motor unit recruitment during muscle contraction?

Accepted Answer

Weakest motor units are recruited first, followed by stronger motor units as needed.

Question 20

Which of the following is a consequence of aging on muscle tissue?

Accepted Answer

Decrease in reflex speed and increase in slow oxidative fiber numbers

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

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