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It involves a sequence of contraction and relaxation of heart chambers.
The heart relaxes and fills with blood.
The heart contracts and ejects blood.
Diastole is relaxation; systole is contraction.
Pressure from filling atria opens the AV valves.
Closing of the semilunar valves due to pressure changes.
Contraction of the ventricles.
Approximately 1.8 seconds under normal conditions.
The pressure decreases as the volume increases.
They open to allow blood flow from atria to ventricles.