When an action potential reaches the end of an axon, the depolarization causes what ionic movement in the presynaptic cell?
A) Sodium out of the cell
B) Lithium out of the cell
C) Iron into the cell
D) Calcium into the cell

Question

Quizplus · Accepted Answer

When the action potential reaches the end of an axon, the depolarization causes calcium ions to enter the presynaptic cell. This influx of calcium triggers the release of neurotransmitters from vesicles into the synaptic cleft.

When an Action Potential Reaches the End of an Axon