Physiology Heart, Circulation, and Blood 794e2f20 Phase 2 of the action potential is due to? A Sodium influx B Potassium influx C Calcium influx D Chloride influx High-Yield Explanation Ans. (c) Calcium influx(Ref: Ganong, 25th ed/p.521)In ventricular action potential, Phase 2 is the plateau phasePhase 2 is due to calcium influx