During this phase ATPase-dependent ion pumps exchange intracellular sodium and calcium ions for extracellular potassium, thus, restoring the resting ionic gradients. When an equilibrium state is reached mV
Figure HE.4 Atrial and ventricular myocyte action potentials electrostatic forces equal the chemical forces acting on the different ions and RMP is re-established. This phase corresponds to diastole.
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