High resolution

Module 7: Figure cardiac action potential

Cardiac action potential.

The action potential in cardiac cells, as shown here for the ventricular cells, is driven by ion channels that conduct either the inward Na+ and Ca2+ currents (shown in green) to depolarize the membrane or outward K+ currents (shown in red) that hyperpolarize the membrane. The time course of these ionic currents generated by these channels determines the shape of the action potential.