The cell membrane of a muscle cell is:
Correct answer: B. Sarcolemma
- A. Sarcoplasm
- B. Sarcolemma
- C. Sarcomere
- D. Myofibrils
Explanation
The sarcolemma is the specialized cell membrane of muscle cells, also known as muscle fibers. It surrounds and encapsulates the muscle cell, playing a crucial role in the excitation-contraction coupling process, which is essential for muscle contraction. Sarcomere (Option C) is the basic structural and functional unit of a muscle fiber, while sarcoplasm (Option A) refers to the cytoplasm of a muscle cell. Myofibrils (Option D) are long, thread-like structures within muscle cells that contain the contractile proteins responsible for muscle contraction.
This question appeared on the UHS MDCAT 2023 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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