If the axon terminal of a motor neuron suddenly became permeable to calcium ions,
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

The influx of calcium ions into the axon terminal is necessary for neurotransmitter release at the motor end plate, which in turn causes depolarization of the muscle cell membrane and muscle contraction. Therefore, if the axon terminal suddenly became permeable to calcium ions, the motor end plate would be depolarized, leading to muscle contraction.

If the Axon Terminal of a Motor Neuron Suddenly Became