What ion channels in the contractile cardiac muscle fiber are open and conducting during the initial repolarizing phase of an action potential?

Name: What ion channels in the contractile cardiac muscle fiber are open and conducting during the initial repolarizing phase of an action potential?
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Question

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During the initial repolarizing phase of a cardiac action potential, fast voltage-gated K⁺ channels open, allowing K⁺ to exit the cell, which contributes to the repolarization process.

What Ion Channels in the Contractile Cardiac Muscle Fiber Are