<prompt> At the end of repolarization, the nerve is hyperpolarized. How does the membrane potential return to RMP?Action of Na K -pumpInward leakage of NaDecrease in K effluxNone of the above mechanisms  <response>: Simultaneously with the action of the pump, there is inward diffusion of Na through the leaky channels not the voltage-gated channels that cause depolarization. This inward leakage of positive charges will take the membrane potential from - 90 mV to original RMP of - 70 mV. Both the pump and the inward leakage will balance out once the potential again reaches - 70 mV. 