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semilunar valves
Due to pressure changes in different chambers of the heart. For example, when the atria contract, the bicuspid and tricuspid valves open. They get closed, when the ventricles contract. When the ventricles contract the aortic and pulmonary valves open. Aortic and pulmonary valves close, when the ventricles relax.
It is the pulmonary valve. Sigmoid is only a synonyme for semilunar (includes pulmonary and aortic valves).
arterial or semilunar valve
Well, between the right ventricle and the pulmonary arteries is an atrioventricular valve called the PULMONARY VALVE . Between the left ventricle and the aorta is an atrioventricular valve called the AORTIC VALVE
The difference between lub and dub (The heart sounds S1 and S2 of a heartbeat) is that the lub occurs when atrioventricular valves close, and dub occurs when the aortic and pulmonary valves close (valves leading out of the heart from the left and right ventricles).
Atrioventricular valves Bicuspid Valve Tricuspid valve Pulmonary valve Aortic valve these are all the valves which are part of the heart.
At the end of ventricular systole, the ventricles relax; the semilunar valves snap shut, preventing backflow, and momentary, the ventricles are closed chambers. The aortic semilunar valves snaps shut, a momentary increase in the aortic pressure results from the elastic recoil of the aorta after valves closure.
You have the atrioventricular valves that are the valves separating each atrium from the ventricles. The right AV valve is the tricuspid valve, while the left AV valve is the bicuspid/mitral valve. There are also two valves that lead from the heart to the pulmonary and aortic arteries. These are the pulmonary and aortic valves. They are both semilunar valves because of their shape.
The two semiluar valves are at the exits from the ventricles the pulmonary valve between the right ventricle and the pulmonary artery and the aortic valve between the left ventricle and the aorta. This means that their function is to assist the heart valves to control blood flow.
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.
I would have to say; depending if it's the left or right side. Left side it would be the aortic valve and the right side would be the pulmonary valve.