Plateau phase of cardiac muscle is due to
Ca2+ influx through more slowly opening Ca2+ channels produces the plateau phase The initial depolarization is due to Na+ influx through rapidly opening Na+ channels Repolarization is due to net K+ efflux through multiple types of K+ channels Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:491
East Na + channel opening
Opeaning of Ca++Na+ channels
Opeaning of Slow Ca++ channels
Opeaning of K + channels
Cardiovascular system