객관식
What is the role of the calcium ion in the signaling of an action potential at the neuromuscular junction?
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9. Muscle Tissue
Steps of Muscle Contraction
객관식
In a skeletal muscle fiber, which structure would you expect to have the greatest total surface area?
A
Sarcolemma.
B
Sarcoplasmic Reticulum.
C
Sarcomere.
D
T-Tubule.
검증된 단계별 안내1
Understand the function of each structure: The sarcolemma is the plasma membrane of the muscle cell, the sarcoplasmic reticulum is involved in calcium storage and release, the sarcomere is the contractile unit, and the T-tubules are invaginations of the sarcolemma that help transmit action potentials.
Consider the surface area: The sarcoplasmic reticulum is an extensive network of tubules and cisternae that wraps around each myofibril, providing a large surface area for calcium ion exchange.
Compare with other structures: The sarcolemma, while covering the entire muscle fiber, does not have the extensive internal network that the sarcoplasmic reticulum has. The T-tubules are extensions of the sarcolemma and do not have as much surface area as the sarcoplasmic reticulum.
Analyze the role of the sarcoplasmic reticulum: Its extensive network is crucial for its role in muscle contraction, as it releases calcium ions that trigger the interaction between actin and myosin filaments.
Conclude that the sarcoplasmic reticulum, due to its extensive and intricate network, has the greatest total surface area among the structures listed.
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