Action potentials result from an:
A) inflow of potassium followed by an outflow of sodium.
B) inflow of sodium followed by an outflow of potassium.
C) outflow of positively charged potassium ions.
D) inflow of positively charged sodium ions.

Question

Quizplus · Accepted Answer

Action potentials result from an inflow of sodium followed by an outflow of potassium. This is due to the opening and closing of ion channels in the neuronal membrane, which allows for the movement of ions across the membrane and the generation of an electrical signal. During an action potential, sodium channels open first, allowing sodium to rush into the cell and depolarize the membrane. This triggers the opening of potassium channels, which allows potassium to flow out of the cell and repolarize the membrane.

Action Potentials Result from An