When an action potential begins
A) sodium is blocked from leaving the neuron cytoplasm.
B) sodium is blocked from entering the neuron cytoplasm.
C) sodium diffuses from the interstitial fluid into the neuron cytoplasm.
D) sodium diffuses from the neuron cytoplasm into the interstitial fluid.
E) sodium is actively pumped from the interstitial fluid into the neuron cytoplasm.

Question

Quizplus · Accepted Answer

When an action potential begins, voltage-gated sodium channels open, allowing sodium ions to diffuse from the interstitial fluid into the neuron cytoplasm, causing depolarization.

When an Action Potential Begins