Which of the following events triggers the subsequent steps of excitation-contraction coupling?

A. Release of calcium ions from the terminal cisterns of the sarcoplasmic reticulum

B. Propagation of an action potential along the sarcolemma and T tubules

C. Binding of calcium ions to troponin, which removes the blocking action of tropomyosin

D. Release of acetylcholine from axon terminals at the neuromuscular junction

Question

Sherlyn

Biology

3 September, 06:15

Which of the following events triggers the subsequent steps of excitation-contraction coupling?

A. Release of calcium ions from the terminal cisterns of the sarcoplasmic reticulum

B. Propagation of an action potential along the sarcolemma and T tubules

C. Binding of calcium ions to troponin, which removes the blocking action of tropomyosin

D. Release of acetylcholine from axon terminals at the neuromuscular junction

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Answers (1)

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Gabriela Park · Answer 1

D

Explanation:

results in the release of calcium ions from the sarcoplasmic reticulum.

option D is the 1st process that starts the excitation-contraction coupling.