Question 1

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

Accepted Answer

Storing calcium ions

Question 2

Which muscle type is striated, voluntary, and multinucleated?

Accepted Answer

Skeletal muscle

Question 3

What is the correct order of connective tissue layers from outermost to innermost in a skeletal muscle?

Accepted Answer

Epimysium, Perimysium, Endomysium

Question 4

Which protein is the main component of thick filaments in muscle fibers?

Accepted Answer

Myosin

Question 5

During muscle contraction, which event occurs according to the sliding filament theory?

Accepted Answer

Thin filaments slide past thick filaments

Question 6

Which of the following best describes the role of acetylcholine at the neuromuscular junction?

Accepted Answer

It binds to receptors on the sarcolemma to initiate an action potential

Question 7

If acetylcholinesterase is inhibited at the neuromuscular junction, what is the most likely result?

Accepted Answer

Muscle contraction will be prolonged

Question 8

Which energy pathway provides the fastest source of ATP for muscle contraction?

Accepted Answer

Creatine phosphate pathway

Question 9

How many ATP molecules are produced per glucose molecule during anaerobic glycolysis?

Accepted Answer

$$2$$

Question 10

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

Accepted Answer

Slow oxidative fibers

Question 11

A patient is unable to relax their muscles after contraction. Which ion is most likely not being properly removed from the sarcoplasm?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$

Question 12

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle produces tension without changing length

Question 13

Which period of a muscle twitch corresponds to the time when calcium ions are actively transported back into the sarcoplasmic reticulum?

Accepted Answer

Relaxation period

Question 14

What is the primary cause of muscle fatigue during intense, short-duration exercise?

Accepted Answer

Accumulation of lactic acid

Question 15

Which of the following best describes a motor unit?

Accepted Answer

A group of muscle fibers innervated by a single motor neuron

Question 16

During an action potential in a muscle fiber, which ion rapidly enters the cell to initiate depolarization?

Accepted Answer

$$\mathrm{Na^+}$$

Question 17

Which of the following scenarios best illustrates wave summation in muscle contraction?

Accepted Answer

A muscle fiber receives a second stimulus before it has completely relaxed

Question 18

Which of the following changes is most likely to occur in skeletal muscle as a result of regular endurance exercise?

Accepted Answer

Increase in capillary supply

Question 19

Which of the following is a characteristic shared by both cardiac and skeletal muscle tissue?

Accepted Answer

Both are striated

Question 20

Which of the following best describes the role of ATP in muscle contraction?

Accepted Answer

ATP hydrolysis provides energy for the myosin head to detach from actin

Muscle Tissue: Structure, Function, and Physiology

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