Question 1

Which of the following best describes an isometric muscle contraction?

Accepted Answer

The muscle generates tension without changing length.

Question 2

A motor unit consists of:

Accepted Answer

All the muscle fibers innervated by a single motor neuron.

Question 3

When the frequency of stimulation to a muscle increases, what is the most likely physiological outcome?

Accepted Answer

The muscle produces a sustained contraction known as tetanus.

Question 4

Which of the following best explains how muscle cells generate ATP during intense, short-duration exercise?

Accepted Answer

By glycolysis followed by lactic acid fermentation.

Question 5

Which factor does NOT directly affect the force of muscle contraction?

Accepted Answer

Amount of ATP stored in the muscle.

Question 6

A fast glycolytic muscle fiber is characterized by:

Accepted Answer

Rapid contraction and reliance on anaerobic metabolism.

Question 7

Which of the following best describes the response of skeletal muscle to regular exercise?

Accepted Answer

Increase in mitochondrial density and capillary supply.

Question 8

Which feature is unique to smooth muscle compared to skeletal muscle?

Accepted Answer

Ability to contract without nervous stimulation.

Question 9

Where is smooth muscle most commonly found in the human body?

Accepted Answer

Lining the walls of hollow organs such as the intestines and blood vessels.

Question 10

Disuse atrophy of muscle is most likely to occur in which scenario?

Accepted Answer

After prolonged immobilization, such as wearing a cast.

Question 11

Which equation correctly represents the breakdown of glucose during anaerobic glycolysis in muscle cells?

Accepted Answer

$$\mathrm{C$$_{6}$$H_{12}O$$_{6} \rightarrow 2C_{3}$$H_{6}O$$_{3} + 2ATP}$

Question 12

A patient with paralysis of the lower limb muscles will most likely experience which of the following over time?

Accepted Answer

Atrophy due to lack of neural stimulation.

Question 13

Which of the following is a correct statement about muscle tension?

Accepted Answer

Tension is the force produced by a muscle during contraction.

Question 14

Which of the following best explains why increasing the strength of a stimulus can produce a stronger muscle contraction?

Accepted Answer

It recruits more motor units, leading to greater force.

Question 15

Which of the following is NOT a general feature of smooth muscle?

Accepted Answer

Striated appearance.

Question 16

Which muscle fiber type is most resistant to fatigue and best suited for endurance activities?

Accepted Answer

Slow oxidative fibers.

Question 17

During muscle contraction, which of the following factors will increase the total force produced?

Accepted Answer

Increasing the frequency of stimulation.

Question 18

Which of the following equations represents the direct phosphorylation of ADP by creatine phosphate in muscle cells?

Accepted Answer

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

Question 19

Which scenario best illustrates the difference between disuse atrophy and paralysis-induced atrophy?

Accepted Answer

Disuse atrophy occurs after a period of immobilization, while paralysis-induced atrophy results from loss of nerve supply.

Muscle Physiology: Key Concepts and Mechanisms

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