Question 1

Which of the following is NOT a characteristic of skeletal muscle tissue?

Accepted Answer

It contracts quickly but is easily fatigued.

Question 2

Which connective tissue wrapping surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 3

What is the functional unit of a skeletal muscle fiber?

Accepted Answer

Sarcomere

Question 4

During muscle contraction, which protein does calcium bind to, initiating the process?

Accepted Answer

Troponin

Question 5

Which equation correctly represents the direct phosphorylation of ADP by creatine phosphate?

Accepted Answer

$$ADP + CP \rightarrow ATP + Creatine$$

Question 6

A patient develops muscle rigidity and a rapid increase in body temperature after anesthesia. What is the most likely diagnosis?

Accepted Answer

Malignant hyperthermia

Question 7

Which type of muscle tissue is found in the walls of hollow organs and is responsible for peristalsis?

Accepted Answer

Smooth muscle

Question 8

What is the primary function of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

To break down acetylcholine and prevent continuous muscle contraction

Question 9

Which of the following best describes the 'all-or-none' response in muscle fibers?

Accepted Answer

A muscle fiber contracts completely when stimulated above threshold.

Question 10

Which process is responsible for the removal of calcium ions from the sarcoplasm after muscle contraction?

Accepted Answer

Active transport by Ca$$^{2+}-$$ATPase pumps

Question 11

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

Accepted Answer

Slow oxidative fibers

Question 12

What is the main source of ATP during long-term, moderate-intensity exercise?

Accepted Answer

Aerobic respiration

Question 13

Which structure in a muscle fiber acts as a voltage sensor and triggers calcium release from the sarcoplasmic reticulum?

Accepted Answer

T-tubule

Question 14

Which of the following best explains the 'size principle' in motor unit recruitment?

Accepted Answer

Small motor units are activated first, followed by larger ones as more force is needed.

Question 15

Which equation represents the net gain of ATP from anaerobic glycolysis?

Accepted Answer

$$Glucose \rightarrow 2 ATP + 2 Lactic Acid$$

Question 16

Which of the following is a function of muscle tissue related to homeostasis?

Accepted Answer

Thermogenesis through shivering

Question 17

What is the effect of extensive overlap of actin with myosin in the sarcomere?

Accepted Answer

Less tension is generated due to interference.

Question 18

Which type of contraction occurs when muscle tension increases but the muscle does not shorten?

Accepted Answer

Isometric contraction

Question 19

Which of the following is TRUE regarding muscle tone?

Accepted Answer

It stabilizes joints and maintains posture.

Question 20

Which of the following is a homeostatic imbalance characterized by progressive muscle weakness due to loss of functional ACh receptors?

Accepted Answer

Myasthenia gravis

Muscles and Muscle Tissue: Structure, Function, and Physiology

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