Question 1

Which of the following best describes the main function of the connective tissue layers (endomysium, perimysium, epimysium) in skeletal muscle?

Accepted Answer

They protect, support, and organize muscle tissue, and provide pathways for nerves and blood vessels.

Question 2

A patient presents with muscle weakness and rapid fatigue during exercise. Laboratory tests reveal a mitochondrial disorder. Which ATP production pathway is most likely impaired?

Accepted Answer

Aerobic respiration

Question 3

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

Accepted Answer

ACh release → Action potential → Ca2+ release → Cross-bridge formation

Question 4

Which muscle fiber type is most likely to be predominant in the leg muscles of a marathon runner?

Accepted Answer

Slow oxidative (SO)

Question 5

A muscle is held in a fixed position while producing tension. Which type of contraction is occurring?

Accepted Answer

Isometric

Question 6

Which structural feature is unique to cardiac muscle tissue and allows rapid electrical communication between cells?

Accepted Answer

Intercalated discs

Question 7

During muscle contraction, which ion binds to troponin to initiate the movement of tropomyosin and expose actin binding sites?

Accepted Answer

Ca2+

Question 8

Which of the following best explains why smooth muscle can maintain contraction for long periods with minimal ATP consumption?

Accepted Answer

Latch bridge mechanism

Question 9

Which equation correctly represents the rapid ATP generation from creatine phosphate in muscle fibers?

Accepted Answer

$$\mathrm{Creatine~phosphate} + \mathrm{ADP} \rightarrow \mathrm{Creatine} + \mathrm{ATP}$$

Question 10

Which property of muscle tissue allows it to return to its original length after being stretched or contracted?

Accepted Answer

Elasticity

Question 11

A person is unable to relax their muscles after contraction due to a lack of ATP. Which process is directly affected?

Accepted Answer

Detachment of myosin heads from actin

Question 12

Which of the following best describes the role of motor unit recruitment in muscle contraction?

Accepted Answer

It increases the force produced by activating more muscle fibers.

Question 13

Which muscle tissue type is capable of both hypertrophy and hyperplasia during regeneration?

Accepted Answer

Smooth muscle

Question 14

Which of the following scenarios best illustrates an eccentric isotonic contraction?

Accepted Answer

Lowering a heavy box to the ground

Question 15

Which of the following is a distinguishing feature of single-unit smooth muscle?

Accepted Answer

Fibers are connected by gap junctions and contract together

Question 16

Which of the following best explains why cardiac muscle cells rarely regenerate after injury?

Accepted Answer

They are replaced by fibrosis due to limited regenerative capacity.

Question 17

Which of the following adaptations is most likely to occur in skeletal muscle after several months of aerobic endurance training?

Accepted Answer

Increased number of mitochondria and capillaries

Question 18

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

Accepted Answer

It stores and releases calcium ions.

Question 19

Which of the following is the correct description of a sarcomere?

Accepted Answer

The functional unit of a muscle fiber, extending from Z-line to Z-line

Question 20

Which neurotransmitter is released at the neuromuscular junction to initiate skeletal muscle contraction?

Accepted Answer

Acetylcholine (ACh)

Muscle Tissue: Structure, Function, and Physiology

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