Sarcolemma is the unique name for the plasma membrane of a muscle fiber. It surrounds the sarcoplasm, which contains the muscle cell's specialized organelles called myofibrils. Option A refers to the T-tubules, which are extensions of the sarcolemma that run perpendicular to the myofibrils. Option B refers to the sarcomere, which is the contractile unit of a myofibril, and is bounded by Z-lines.

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Sarcolemma Is A

Question 40

Multiple Choice

Sarcolemma is a:

A) system of transverse tubules that extend at a right angle to the long axis of the cell.
B) segment of the myofibril between two successive Z-lines.
C) unique name for the plasma membrane of a muscle fiber.
D) None of the above are correct.

Correct Answer: