The plateau phase of Myocardial action potential is due to: (A) Efflux of Na+, (B) Influx of Ca++, (C) Influx of K+, (D) Closure of voltage gated K+ channels
Answer is B. Ca2+ influx through more slowly opening Ca2+ channels produces the plateau phaseRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No: 491