<prompt> The plateau phase 2 of the ventricular myocyte action potentialDescribes when Ca2 is the only ion moving through the membraneDescribes when Ca2 influx is balanced by Na effluxDescribes when Ca2 and Na influx is balanced by K effluxCan be prolonged by sympathetic nerve stimulation  <response>: During the plateau phase phase 2, the membrane;s conductance to K is low. However, the electrochemical gradient for K is so strong that some K does leak out. The K efflux is balanced by the inward movement of Ca2 and Na through the slow Ca2 channels so that the membrane potential plateaus above 0 mV. Sympathetic stimulation and drugs, which increase the concentration of cytosolic Ca2 digitalis, shoen the duration of the plateau phase by increasing K. Ref - Harrison;s internal medicine 20e pg 1716 