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

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

Quizplus · Accepted Answer

When an action potential reaches the end of an axon, the depolarization causes the opening of voltage-gated calcium ion channels in the presynaptic cell. This allows calcium ions to enter the cell, triggering the release of neurotransmitters into the synaptic cleft. Sodium and lithium ions are not involved in this process, and iron is not a typical ion involved in neurotransmitter release.

When an Action Potential Reaches the End of an Axon,the