Which event during the cardiac cycle causes the aortic and pulmonary SL valves to open?
a. atrial diastole
b. atrial systole
c. ventricular diastole
d. ventricular systole
During ventricular systole, there is blood ejection from the ventricles, aorta and pulmonary artery, necessarily must be opened, to allow blood to pass through and complete the heart cycle.
