The Magnitude of Depolarization at the Peak of an Action

Multiple Choice

The magnitude of depolarization at the peak of an action potential is dependent on what factor?

A) the length of the refractory period
B) the size of the stimulus
C) the concentration of sodium and potassium ions
D) the strength of the electrochemical gradient for sodium and potassium ions relative to their permeability to these ions
E) the size of the graded potential