Each muscle fiber is surrounded by a modified cell membrane called:
Correct answer: A. Sarcolemma
- A. Sarcolemma
- B. Sarcoplasmic reticulum
- C. Sarcomere
- D. Myofilament
Explanation
The correct answer is the sarcolemma, which is the modified cell membrane surrounding each muscle fiber. It is essential for maintaining the structural integrity of the muscle cell and plays a vital role in the transmission of action potentials and muscle contractions. The other options, such as the sarcoplasmic reticulum, sarcomere, and myofilament, refer to different components within the muscle fiber that contribute to its function but do not serve as the membrane surrounding the fiber.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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About Muscles
Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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