During the rising phase of the action potential: A) P_K+ is much greater than P_Na+. B) P_Na+ is much greater than P_K+. C) P_K+ is the same as P Na⁺. D) Na⁺ efflux occurs. E) P_Na+ is much greater than P_K+, and Na⁺ efflux occurs.

Question

Quizplus · Accepted Answer

During the rising phase of the action potential, the voltage-gated Na+ channels are open and there is a large influx of Na+ into the cell, while the voltage-gated K+ channels are closed. Therefore, P_Na+ is much greater than P_K+.

During the Rising Phase of the Action Potential