The prolonged electrical depolarization of cardiac muscle cells that occurs during contraction is due primarily to the persistent influx of what ion?

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The prolonged electrical depolarization of cardiac muscle cells during contraction is due primarily to the persistent influx of calcium ions. This influx is responsible for the plateau phase of the cardiac action potential, as well as the activation of the contractile machinery of the muscle cells.

The Prolonged Electrical Depolarization of Cardiac Muscle Cells That Occurs