When a neuron is stimulated and causes depolarization of the nerve, what occurs?
A) Calcium rushes into the cell.
B) Sodium rushes into the cell.
C) Potassium rushes into the cell.
D) Sodium and potassium are actively pumped out to the cell.
B
Feedback:
When depolarization occurs, sodium rushes into the cell. During repolarization, potassium is pumped out of the cell and the resting membrane potential is reestablished. Calcium ions decrease the cell membranes' permeability to sodium and increase the threshold needed to depolarize the cell.
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