Multiple Choice
In the context of muscle contractions, the contractile unit of a muscle cell is the:
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15. Cytoskeleton and Cell Movement
Muscle Contractions
Multiple Choice
In the context of muscle contractions, what is the name of the cell membrane of a muscle fiber?
A
Sarcoplasmic reticulum
B
Endomysium
C
Sarcolemma
D
Myelin sheath
Verified step by step guidance1
Understand that the question asks for the specific name of the cell membrane surrounding a muscle fiber, which is a specialized muscle cell.
Recall that in muscle cells, the plasma membrane is uniquely named to distinguish it from other cell types.
Identify that the sarcolemma is the term used for the muscle fiber's cell membrane, which encloses the cytoplasm and organelles of the muscle cell.
Differentiate the sarcolemma from other structures listed: the sarcoplasmic reticulum is an internal membrane system involved in calcium storage, the endomysium is connective tissue surrounding individual muscle fibers, and the myelin sheath is related to nerve cells, not muscle fibers.
Conclude that the correct term for the muscle fiber's cell membrane is the sarcolemma.
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