Noun
the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next; an electrical impulse conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles
Source: WordNetthe cardiac cycle can be shown on an electrocardiogram Source: Internet
At the beginning of the cardiac cycle, in early diastole, both the atria and ventricles are relaxed. Source: Internet
Diastolic pressure is minimum pressure in the arteries, which occurs near the beginning of the cardiac cycle when the ventricles are filled with blood. Source: Internet
Systolic pressure is peak pressure in the arteries, which occurs near the end of the cardiac cycle when the ventricles are contracting. Source: Internet