<prompt> Answer this question truthfullyWhat causes Phase 2 of the myocardial action potential plateau and what is the role of voltage-gated channels in this phase?  <response>: <reason> Phase 2 of the myocardial action potential plateau is caused by a balance of K efflux and Ca2 influx through voltage-gated channels. During this phase, the membrane potential remains relatively constant, allowing for sustained contraction of the cardiac muscle cells. The influx of Ca2 through voltage-gated channels helps to maintain the plateau phase and prolong the action potential. 