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step one
blood from the body enters the right atrium through the vena cava
blood from lungs enters the left atrium though the pulmonary vein
both atria contract
step two
blood is pushed down into the right and left ventricles
the valves close to prevent the blood going back up into the atria
step three
the ventricles contract
blood is pushed out of the left ventricle into the lungs
blood is pushed out of the right ventricle into the body
all four chambers relax
definition
the sequence of events that happen between the beginning of one heart beat and the beginning of the next.