Transmembrane potential of ventricular cells and its ionic mechanisms Resting Potential: -90 mV 2 Action potential 0 Phase 0: Depolarization E-20 Phase 1: Early phase of rapid repolarization Phase2: Plateau(平台期) Phase 3: Late phase of rapid repolarization 4 Phase 4: Resting phase 100 50050100150200250 Time(msec)Transmembrane potential of ventricular cells and its ionic mechanisms Resting Potential: -90 mV Action Potential • Phase 0: Depolarization • Phase 1: Early phase of rapid repolarization • Phase 2: Plateau（平台期） • Phase 3: Late phase of rapid repolarization • Phase 4: Resting phase