Multiple Choice
When a cross-bridge structure is formed during a muscle contraction, the band lengths shorten and contract.
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15. Cytoskeleton and Cell Movement
Muscle Contractions
Multiple Choice
In skeletal muscle fibers, what is the name of the muscle cell membrane?
A
Endomysium
B
Sarcoplasmic reticulum
C
Sarcolemma
D
Sarcoplasm
Verified step by step guidance1
Understand that skeletal muscle fibers are specialized cells with unique structures, including a specific membrane that surrounds each muscle fiber.
Recall that the general term for a cell membrane is the plasma membrane, but in muscle cells, this membrane has a special name.
Identify the options given: Endomysium (a connective tissue layer), Sarcoplasmic reticulum (an internal membrane system for calcium storage), Sarcolemma, and Sarcoplasm (the cytoplasm of muscle cells).
Recognize that the muscle cell membrane is called the Sarcolemma, which functions as the plasma membrane of the muscle fiber, playing a key role in conducting electrical signals.
Conclude that the correct term for the muscle cell membrane in skeletal muscle fibers is Sarcolemma.
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