Blood flows from the atria to the ventricles during ventricular diastole, and from the ventricles to the pulmonary artery and the aorta during ventricular systole during the cardiac cycle .
- The cardiac cycle is a sequence of electrical and mechanical events that take place when the heart is contracting and relaxing (diastole) (systole).
- Blood flows from the atria to the ventricles during ventricular diastole, and from the ventricles to the pulmonary artery and the aorta during ventricular systole.
- The atrial musculature begins to contract with atrial depolarization. The pressure inside the atrial chambers rises as the atria contract, pushing more blood across the open atrioventricular (AV) valves and causing a quick flow of blood into the ventricles.
- The atria relax (atrial diastole) and receive venous return from both the body and the lungs during ventricular contraction.
- The lower chambers then loosen up during ventricular diastole, enabling initial passive filling of of the thick-walled ventricles and emptying of the atria.
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