When an Action Potential from a Motor Neuron Arrives at the Neuromuscular

Multiple Choice

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) ?

A) acetylcholine (ACh) release
B) action potential propagation down the T tubules
C) conformational change in troponin
D) depolarization of the muscle cell
E) release of Ca2+ from the sarcoplasmic reticulum