A nerve impulse (action potential) is caused initially by the
A) inward movement of potassium ions.
B) inward movement of sodium ions
C) outward movement of potassium ions.
D) outward movement of sodium ions.

Question

Quizplus · Accepted Answer

The initiation of a nerve impulse or action potential is primarily caused by the inward movement of sodium ions (Na+) into the neuron, which depolarizes the membrane.

A Nerve Impulse (Action Potential) Is Caused Initially by the