Ventricular Action Potentials

Channels:

Na+ fast channels. Active briefly during the phase 0.

Slow and fast Ca++ channels. Active during the phase 2.

Leaky K+ channels. Always active.

Inward rectifying transient K+ channels. Active during the phase 1.

Inward rectifying delayed K+ channels. Active during the phase 2 early part and phase 3.

Inward rectifying K+ channels. Active during the phase 3. Primary channels to help restore resting potential.

Na+/K+ ATPase pump. Restores the ionic imbalance after an action potential has occurred. Moves K+ in and Na+ out of the cells.

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Drbeen

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