Repolarization

Repolarization is the process by which a muscle cell, like a heart cell, resets its electrical state after being activated. When the cell's membrane becomes electrically excited, ions like sodium and calcium enter, causing contraction. Repolarization follows as potassium ions exit the cell, restoring it to its resting state. This process ensures the cell is ready for the next activation, maintaining proper heart rhythm and function. Think of it like recharging a battery—after a burst of energy, it needs to reset before it can fire again.