The rising phase of the action potential is due to which of these conditions
A)calcium equilibrium
B)potassium efflux
C)potassium influx
D)sodium influx

Question

Quizplus · Accepted Answer

The rising phase of the action potential is due to sodium influx, meaning the movement of sodium ions into the cell. This is what causes the membrane potential to become more positive and triggers the depolarization phase of the action potential. Once the threshold is reached, voltage-gated sodium channels open and allow sodium ions to rush into the cell, causing the rapid depolarization that characterizes the rising phase of the action potential.

The Rising Phase of the Action Potential Is Due to Which