When an action potential from a motor neuron arrives at the neuromuscular junction (NMJ), a series of events occurs that leads to muscle contraction. Which of the following events will occur last (that is, after all of the others listed below) ?
a. depolarization of the muscle cell
b. release of Ca2 + from the sarcoplasmic reticulum
c. acetylcholine (ACh) release
d. conformational change in troponin
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