Repolarization is caused by which channels in ventricular muscles
Action potential in Ventricular Myocardium
Resting membrane potential in ventricular myocardium is -90 mV. The action potential is divided into 5 phases starting from 0.
Rapid depolarization is due opening of Na channels
Initial rapid repolarization is due to the closure of Na channel and opening of K channels
Plateau phase is due to slow but the prolonged opening of voltage-gated Ca channels
Phase 3 and Phase 4
Phase 3 Late rapid repolarization and Phase 4 baseline is due to the closure of slow Ca channels and slow delayed increase K efflux via various K channels