Chordae tendineae
69 times
The AV valves lie between the atria and the ventricles of the heart. The closing of these valves produces the lub-dub sound heard when the heart is auscultated.
Cuspid valves are right and left atrioventricular (AV) valves.
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.
a heart murmur
Semilunar valves are open when the blood is being pumped. The AV valves are closed when the semilunar valves are open.
When the ventricles are relaxed, the semilunar valves are closed, while the atrioventricular (AV) valves are open. This allows blood to flow from the atria into the ventricles. The closure of the semilunar valves prevents backflow of blood from the arteries into the ventricles during this phase.
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.
when ventricular pressure becomes greater than atrial pressure
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
yes during ventricular systole AV valves are closed.
the valves close