Please the events of the cardiac cycle in order. = #1 Blood continuously flows into both atria. Two thirds of the atrial blood flows passively into the ventricles. The right and left AV valves are closed and the aortic and pulmonary semilunar valves are opened. The pressure of incoming blood opens the right and left AV valves. = The atria contract to pump the remaining blood into the ventricles. = #5 The atria relax, and the ventricles begin to contract. = #8 The ventricles relax, and the semilunar valves are closed. = Ventricular contraction pumps blood into the arteries.

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