Question 1

Which of the following is NOT a common property shared by all muscle tissue types?

Accepted Answer

Secretion

Question 2

A patient is unable to maintain posture and body position due to a muscle disorder. Which function of skeletal muscle is most directly impaired?

Accepted Answer

Maintaining posture and body position

Question 3

Which connective tissue layer surrounds individual muscle fibers and contains capillary networks and myosatellite cells?

Accepted Answer

Endomysium

Question 4

During a muscle contraction, which of the following changes occur according to the sliding-filament theory?

Accepted Answer

The H bands and I bands narrow

Question 5

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

Accepted Answer

It stores and releases calcium ions

Question 6

A muscle fiber is stimulated by a motor neuron, leading to contraction. Which neurotransmitter is released at the neuromuscular junction to initiate this process?

Accepted Answer

Acetylcholine

Question 7

Which of the following events occurs first during excitation-contraction coupling in skeletal muscle?

Accepted Answer

Action potential travels along the sarcolemma and down T tubules

Question 8

A muscle is unable to relax after death due to a lack of ATP. What is this condition called?

Accepted Answer

Rigor mortis

Question 9

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

Accepted Answer

They rely primarily on anaerobic metabolism

Question 10

A weightlifter is performing a biceps curl. As the muscle shortens while lifting the weight, which type of contraction is occurring?

Accepted Answer

Isotonic concentric contraction

Question 11

Which equation correctly represents the direct phosphorylation of ADP by creatine phosphate (CP) in muscle cells?

Accepted Answer

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

Question 12

Which of the following is a structural characteristic unique to cardiac muscle cells compared to skeletal muscle fibers?

Accepted Answer

Intercalated discs

Question 13

A marathon runner is able to sustain activity for long periods. Which muscle fiber type is most responsible for this endurance?

Accepted Answer

Slow fibers

Question 14

Which of the following best describes the role of myoglobin in muscle fibers?

Accepted Answer

It binds oxygen for aerobic metabolism

Question 15

Which of the following statements about smooth muscle tissue is TRUE?

Accepted Answer

It has spindle-shaped cells with a single nucleus

Question 16

A patient with a genetic defect in the protein titin would most likely have problems with which aspect of muscle function?

Accepted Answer

Restoring resting sarcomere length after contraction

Question 17

Which of the following best explains why cardiac muscle cannot undergo tetanic contractions?

Accepted Answer

It has a long refractory period

Question 18

During intense exercise, when oxygen is limited, which metabolic pathway is primarily used by skeletal muscle fibers to generate ATP?

Accepted Answer

Anaerobic glycolysis

Question 19

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

Accepted Answer

Increasing the number of active motor units to produce greater tension

Question 20

A patient with muscle atrophy due to immobilization will experience which of the following changes at the cellular level?

Accepted Answer

Reduction in muscle fiber diameter

Muscle Tissue: Structure, Function, and Organization

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