Multiple Choice
Which of the following structures is composed of actin, but no myosin?
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15. Cytoskeleton and Cell Movement
Muscle Contractions
Multiple Choice
In skeletal muscle physiology, what is the name of the cell membrane of a muscle fiber?
A
T-tubule
B
Endomysium
C
Sarcolemma
D
Sarcoplasmic reticulum
Verified step by step guidance1
Understand that the question asks for the name of the cell membrane specifically in a muscle fiber, which is a specialized muscle cell.
Recall that in skeletal muscle physiology, the cell membrane surrounding each muscle fiber is called the sarcolemma. This membrane plays a crucial role in conducting electrical signals that trigger muscle contraction.
Differentiate the sarcolemma from other structures listed: the T-tubule is an invagination of the sarcolemma that helps propagate action potentials into the muscle fiber; the endomysium is connective tissue surrounding individual muscle fibers; and the sarcoplasmic reticulum is an organelle involved in calcium storage and release.
Conclude that the correct term for the muscle fiber's cell membrane is the sarcolemma, as it directly encloses the muscle cell and facilitates communication and ion exchange.
Summarize that knowing the specific roles and locations of these structures helps in identifying the sarcolemma as the muscle fiber's cell membrane.
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