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) acetylcholine (ACh) release
B) conformational change in troponin
C) depolarization of the muscle cell
D) release of Ca²⁺ from the sarcoplasmic reticulum

Question

Quizplus · Accepted Answer

The conformational change in troponin occurs last, as it happens after calcium ions are released from the sarcoplasmic reticulum and bind to troponin, allowing muscle contraction to proceed.

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