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)?

Question

Quizplus · Accepted Answer

The conformational change in troponin occurs last in the sequence described. This change is triggered by the increase in calcium ion concentration in the cytosol, which follows the release of calcium from the sarcoplasmic reticulum. This release is itself triggered by the action potential propagation down the T-tubules, which occurs after the depolarization of the muscle cell membrane, initiated by the release of acetylcholine (ACh) at the neuromuscular junction.

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