An action potential from a motor neuron arriving at the neuromuscular junction (NMJ) triggers a series of events leading to muscle contraction. Of the following four events, which occurs after the others?
A) acetylcholine (ACh) release
B) the myosin-binding sites on actin are exposed
C) depolarization of the muscle cell
D) release of Ca2+ from the sarcoplasmic reticulum

Question

Quizplus · Accepted Answer

The myosin-binding sites on actin are exposed after the release of Ca2+ from the sarcoplasmic reticulum, which occurs due to the depolarization of the muscle cell triggered by acetylcholine (ACh) release.

An Action Potential from a Motor Neuron Arriving at the Neuromuscular