Question 1

Which connective tissue layer surrounds individual muscle fibers and is the deepest layer of skeletal muscle connective tissue?

Accepted Answer

Endomysium

Question 2

During a maximal sprint, which energy system is primarily responsible for ATP production in skeletal muscle?

Accepted Answer

Glycolysis (anaerobic metabolism)

Question 3

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions ($$\mathrm{Ca$$^{2+}$$}) $$necessary for contraction.

Question 4

A patient is unable to relax their muscles after contraction due to a defect in the removal of calcium from the sarcoplasm. Which process is most likely impaired?

Accepted Answer

Reuptake of $$\mathrm{Ca$$^{2+}$$}$$ into the sarcoplasmic reticulum

Question 5

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

Accepted Answer

Maximum tension is produced when there is optimal overlap between thick and thin filaments.

Question 6

Which type of muscle contraction occurs when the muscle lengthens while generating force, such as lowering a heavy object?

Accepted Answer

Eccentric contraction

Question 7

A weightlifter performs repeated lifts, leading to muscle fatigue. Which of the following is LEAST likely to contribute to this fatigue?

Accepted Answer

Increased oxygen delivery to the muscle

Question 8

Which of the following best explains why fast muscle fibers fatigue more quickly than slow muscle fibers?

Accepted Answer

Fast fibers have fewer mitochondria and rely on anaerobic metabolism.

Question 9

Which protein covers the active sites on actin, preventing myosin binding in a resting muscle?

Accepted Answer

Tropomyosin

Question 10

During the sliding filament theory of muscle contraction, which event directly causes the power stroke?

Accepted Answer

Release of ADP and phosphate from myosin

Question 11

Which equation correctly represents the conversion of creatine phosphate to ATP during muscle contraction?

Accepted Answer

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

Question 12

Which of the following is a characteristic of cardiac muscle cells that distinguishes them from skeletal muscle cells?

Accepted Answer

They have intercalated discs for electrical coupling.

Question 13

A marathon runner relies primarily on which muscle fiber type for endurance activities?

Accepted Answer

Slow fibers

Question 14

Which process is responsible for the removal of acetylcholine from the synaptic cleft after muscle stimulation?

Accepted Answer

Degradation by acetylcholinesterase

Question 15

Which of the following best describes the role of oxygen debt after intense exercise?

Accepted Answer

It is the amount of oxygen required to restore energy stores and remove lactic acid.

Question 16

Which of the following is TRUE regarding smooth muscle contraction?

Accepted Answer

It is initiated by calcium binding to calmodulin.

Question 17

Which of the following is a multi-step process that occurs during muscle recovery after contraction?

Accepted Answer

ATP is used to detach myosin heads from actin and pump $$\mathrm{Ca$$^{2+}$$}$$ back into the SR.

Question 18

Which of the following is a direct result of hypertrophy in skeletal muscle?

Accepted Answer

Increase in muscle fiber size due to more myofibrils and mitochondria

Question 19

Which of the following is the correct sequence of events in excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential → release of $$\mathrm{Ca$$^{2+}$$}$$ from SR → binding of $$\mathrm{Ca$$^{2+}$$} to $$troponin → cross-bridge formation

Question 20

Which of the following is a real-world example of an isometric muscle contraction?

Accepted Answer

Holding a heavy box stationary without moving it

Skeletal, Cardiac, and Smooth Muscle Tissue: Structure, Function, and Physiology

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