Answer:
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.
The event that triggers the subsequent steps of excitation-contraction coupling is D. Release of acetylcholine from axon terminals at the neuromuscular junction.
Excitation-contraction coupling simply means the sequence of events that have to do with the electrical impulse in the muscle cells initiating the myofilaments which then leads to a contraction.
It should be noted that releasing calcium ions from the terminal cisterns of the sarcoplasmic reticulum and the propagation of an action potential along the sarcolemma and T tubules doesn't lead to the triggering of the excitation-contraction coupling. Rather, the release of acetylcholine from axon terminals at the neuromuscular junction does.
In conclusion, the correct option is D.
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