<prompt> Point at which the ratio of K permeability to Na permeability PKPNa is the greatest.ACEF  <response>: Point A: RMP memebrane potential is closest to the equilibrium potential of potassium ion Point B: Threshold potential Point C: Due to Hodgkin cycle rapid Na influx from voltage gated channels Point D: Na permeability maximum Membrane potential is closest to Na equilibrium potential Ratio of P Na P K maximum Point E: Potassium permeability maximum Point F: Only K permeability, no Na permeability Ratio of P K P Na is maximum 