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)?

Question

Quizplus · Accepted Answer

The release of Ca2+ from the sarcoplasmic reticulum triggers a conformational change in troponin, leading to the exposure of active sites on actin and allowing myosin to bind to actin. This ultimately leads to muscle contraction. Acetylcholine (ACh) release and depolarisation of the muscle cell occur before the release of Ca2+ from the sarcoplasmic reticulum and the conformational change in troponin. Therefore, B (conformational change in troponin) will occur last.

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