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When the right atrium is filled with venous blood, it contracts and forces blood through the tricuspid valve into the right ventricle.

Blood within the venous system carries waste products away from the body tissues and vital organs.

The capillaries connect arterioles to tiny venules, which empty into small veins that carry blood into larger veins and, eventually, the inferior and superior vena cavae.

Systole and Diastole are terms that describe the mechanical activity of the heart.

Systole is the period of contraction during which the ventricles or atria force blood from chamber to chamber and through the blood vessels.