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)?

Question

Quizplus · Accepted Answer

Once Ca²⁺ is released from the sarcoplasmic reticulum, it binds to troponin, causing a conformational change. This change leads to the displacement of tropomyosin and exposes the binding site on actin for myosin. Therefore, the conformational change in troponin occurs last before the binding of actin to myosin, leading to muscle contraction.

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