when ventricular pressure becomes greater than atrial pressure
Semilunar valves are open when the blood is being pumped. The AV valves are closed when the semilunar valves are open.
Chordae tendineae
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.
Open so the ventricle can receive more blood to pump.
69 times
The AV valves open when the blood pressure exerted on their atrial side is greater than that of the ventricle side. This will happen when blood returning to the heart fills the atria and puts pressure against the valve.
depends on the person
The AV valves open when the blood pressure exerted on their atrial side is greater then on the ventricle side. This happens when blood returning to the heart fills the atria and puts pressure against the valve. Note : When heart is completely relaxed, the AV valve flaps hang limply into the ventricle chamber (open) allowing blood from the atria to flow through them directly to the ventricle. Thus, it is the result of ventricle contraction which closes the AV valves and moves them from their resting state (open).
open
The chordae tendinae bring the right ventricular walls closer together, pull semilunar and AV valves open and prevent ballooning of AV valves. The papillary muscles help in the closure and opening of mitral and tricuspid valves.
yes during ventricular systole AV valves are closed.
the valves close