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Compare and contrast the role of L-type calcium channels and the development of an action potential in cardiac contractile cells and in cardiac autorhythmic cells.

User Melek
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Final answer:

L-type calcium channels play a different role in the development of an action potential in cardiac conductive cells compared to cardiac contractile cells.

Step-by-step explanation:

The role of L-type calcium channels and the development of an action potential differ in cardiac conductive cells and cardiac contractile cells.

In cardiac conductive cells, the action potential begins with a slow influx of sodium ions, leading to a gradual rise in membrane potential. This prepotential depolarization is followed by the opening of calcium ion channels, causing a more rapid depolarization.

Repolarization then occurs through the opening of potassium channels.

In cardiac contractile cells, the resting phase is more stable. Upon stimulation by an action potential, there is a rapid depolarization, followed by a plateau phase caused by the influx of calcium ions.

The extended refractory period allows the cell to fully contract before another electrical event can occur.

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