Before an action potential begins, sodium ions have a greater concentration:
A) inside the neuron's cell membrane.
B) outside the neuron's cell membrane.
C) Neither of the above answers is correct. The sodium concentration is the same outside and inside the cell's membrane.

Question

Quizplus · Accepted Answer

Before an action potential begins, sodium ions are more concentrated outside the neuron's cell membrane. This concentration gradient is crucial for the generation of action potentials, as the influx of sodium ions into the neuron is what initiates the depolarization phase.

Before an Action Potential Begins, Sodium Ions Have a Greater