During the plateau phase of the action potentials of myocardial contractile cells, which ion(s)is/are crossing the membrane?

Question

Quizplus · Accepted Answer

During the plateau phase of the action potential of myocardial contractile cells, both Ca²⁺ and K⁺ are crossing the membrane. Ca²⁺ influx prolongs the depolarization phase, while K⁺ efflux repolarizes the cell. This leads to the long refractory period of cardiac muscle, which prevents tetanic contractions and allows for proper pumping and filling of the heart chambers.

During the Plateau Phase of the Action Potentials of Myocardial