Cardiac action potentials see Table

- The resting membrane potential is determined by the conductance to K+ and approaches the K+ equilibrium potential.

- Inward current brings positive charge into the cell and depolarizes the membrane potential.

- Outward current takes positive charge out of the cell and hyperpolar-izes the membrane potential.

- The role of Na+,K+-adenosine triphosphatase (ATPase) is to maintain ion gradients across cell membranes.

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