When an action potential from a motor neuron arrives at the neuromuscular junction (NMJ), a series of events occurs that leads t
o 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
