Question 1

Which membrane surrounds individual muscle fibers in skeletal muscle?

Accepted Answer

Endomysium

Question 2

During muscle contraction, which protein does calcium bind to, initiating the exposure of binding sites for myosin?

Accepted Answer

Troponin

Question 3

Which of the following best describes the role of acetylcholinesterase (AChE) at the neuromuscular junction?

Accepted Answer

It breaks down acetylcholine, terminating the signal.

Question 4

A patient is unable to maintain muscle contraction and experiences rapid fatigue. Which process is most likely impaired?

Accepted Answer

Aerobic respiration in mitochondria

Question 5

Which equation correctly represents the reaction catalyzed by creatine kinase in muscle cells?

Accepted Answer

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

Question 6

Which of the following is TRUE regarding the difference between isometric and isotonic muscle contractions?

Accepted Answer

Isometric contractions generate tension without changing muscle length.

Question 7

A muscle fiber is stimulated repeatedly before it can fully relax, resulting in a sustained contraction. What is this phenomenon called?

Accepted Answer

Complete tetanus

Question 8

Which of the following is a major difference between oxidative and glycolytic muscle fibers?

Accepted Answer

Oxidative fibers rely primarily on aerobic respiration for ATP production.

Question 9

Which process produces the greatest number of ATP molecules per glucose molecule in muscle cells?

Accepted Answer

Aerobic respiration

Question 10

A marathon runner is experiencing muscle fatigue due to insufficient oxygen delivery. Which term best describes the accumulation of metabolic byproducts in this scenario?

Accepted Answer

Oxygen debt

Question 11

Which of the following is NOT a function of the sarcoplasmic reticulum in skeletal muscle?

Accepted Answer

Synthesizing ATP

Question 12

Which of the following best describes the sliding filament model of muscle contraction?

Accepted Answer

Actin and myosin filaments slide past each other, resulting in sarcomere shortening.

Question 13

Which of the following is TRUE about the difference between hemoglobin and myoglobin?

Accepted Answer

Myoglobin stores oxygen in muscle cells, while hemoglobin transports oxygen in blood.

Question 14

Which of the following adaptations is most likely to occur in muscle tissue after resistance exercise?

Accepted Answer

Increased mitochondria and myofibrils

Question 15

Which of the following is a characteristic of smooth muscle but NOT skeletal muscle?

Accepted Answer

Ability to contract without neural stimulation

Question 16

A patient is diagnosed with myasthenia gravis. Which of the following best explains the underlying cause?

Accepted Answer

Destruction of acetylcholine receptors at the neuromuscular junction

Question 17

Which of the following best describes the process of recruitment in muscle physiology?

Accepted Answer

Activating additional motor units to increase muscle force

Question 18

Which of the following is TRUE regarding the end-plate potential (EPP) at the neuromuscular junction?

Accepted Answer

It is a graded depolarization of the muscle fiber membrane.

Question 19

Which of the following is the correct sequence of events for muscle contraction?

Accepted Answer

Release of calcium ions, binding of myosin to actin, ATP hydrolysis, power stroke

Question 20

Which of the following is a direct result of aerobic exercise on skeletal muscle?

Accepted Answer

Increase in mitochondria and capillary density

Muscle Physiology: Chapter 9 Study Guide (Anatomy & Physiology)

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