L-type calcium channels allow the refractory periods in the heart's contractile cells to be about as long as the cells' relaxation periods.

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L-type calcium channels play a crucial role in regulating the duration of cardiac action potentials, allowing for efficient excitation-contraction coupling and proper cardiac rhythm. They contribute to the refractory period of contractile cells, which is about as long as the cells' relaxation periods, preventing premature depolarization and ensuring that the heart beats properly.

L-Type Calcium Channels Allow the Refractory Periods in the Heart's