The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca²⁺ channels.

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The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca2+ channels. These channels are known as L-type (L for long-lasting) or CaV1.2 channels. They are activated by depolarization of the plasma membrane and allow calcium to enter the cell, which triggers muscle contraction.

The Plateau Phase of the Action Potential in a Contractile