Select the Appropriate Relationship Between the Valves Opening and Closing

Select the appropriate relationship between the valves opening and closing and pressure changes during the cardiac cycle.

A) semilunar valves begin to open when the pressure in the ventricles exceed diastolic blood pressure in the aorta or pulmonary artery
B) semilunar valves begin to open when the pressure in the ventricles exceed systolic pressure in the aorta or pulmonary artery
C) atrioventricular valves begin to open when the pressure in the ventricles exceeds the pressure in the atria
D) atrioventricular valves begin to close when the pressure in the aorta or pulmonary artery exceeds the pressure in the ventricles