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 (i.e. ,after all of the others) ?

A) 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