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diastole
(di-as´to-le)
the phase of the cardiac cycle in which the heart relaxes between contractions; specifically, the period when the two ventricles are dilated by the blood
flowing into them. See also blood pressure and heart. adj., diastol´ic., adj.
electrical diastole
that time during which the heart muscle cells rest; it is represented by phase 4 of the action potential.

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