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Semilunar valves are open when the blood is being pumped. The AV valves are closed when the semilunar valves are open.
after the main safety valves are open
By minute electrical singles produced by the heart itself to open and close the valves.
During systole, both atrioventricular valves (tricuspid and mitral) are closed. The aortic valve is open. During diastole, both atrioventricular valves are open, and the aortic valve is closed.
The semilunar valves are open when blood is being pumped by ventricular contraction. This event is called systole.
open
left ventricle
open
yes
DESCRIBE THE ACTION OF HEART VALVES. WHEN DO THEY OPEN AND CLOSE?
There are no valves between the atria. The valves between the atria and ventricles close when the ventricles contract.
As the ventricles of the heart contract the pressure in the ventricles rises beyond that of the atria. This pressure differential causes the AV valves to shut.