Plateau phase of ventricular muscle is d/t opening of: (A) Na+ channel, (B) K+ channel, (C) Ca - Na channel, (D) Closure of K+ channel
Answer is C. Ca2+ influx through more slowly opening Ca2+ channels produces the plateau phaseThe 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