<prompt> Resting membrane potential of a neuron is-9mV-50mV-70mV-100mV  <response>: In neurons, the resting membrane potential is usually about - 70mV, which is close to the equilibrium potential for K. Because there are more open Kchannels than Na channels at rest Ref: Ganong;s Review of medical physiology;25th edition; pg: 90 