If the axon terminal of a motor neuron suddenly became permeable to calcium ion,
A)the neuron will fire an action potential.
B)the motor end plate will be depolarized.
C)the motor end plate will be hyperpolarized.
D)neurotransmitter release will be blocked.
E)the neuron will become unable to stimulate the muscle cell.

Question

Quizplus · Accepted Answer

If the axon terminal of a motor neuron suddenly became permeable to calcium ion, it would lead to depolarization of the motor end plate. This is because calcium ions play a crucial role in triggering the release of acetylcholine, the neurotransmitter that stimulates the muscle cell. The influx of calcium ions into the axon terminal triggers the fusion of vesicles containing acetylcholine with the presynaptic membrane, allowing the neurotransmitter to be released into the synaptic cleft and bind with receptors on the motor end plate, leading to depolarization and muscle contraction.

If the Axon Terminal of a Motor Neuron Suddenly Became