Which of these events happens when an action potential reaches the presynaptic terminal of the motor neuron

Question

Quizplus · Accepted Answer

When an action potential reaches the presynaptic terminal of the motor neuron, acetylcholine is released into the synaptic cleft. This neurotransmitter then binds to receptors on the muscle fiber, causing it to depolarize and initiate muscle contraction.

Note: A is partially correct, but calcium is actually released from the sarcoplasmic reticulum inside the muscle fiber, not from the presynaptic terminal. C and D are not directly related to the release of neurotransmitters from the presynaptic terminal.

Which of These Events Happens When an Action Potential Reaches