How are the AV valves anchored inside the heart?
By strands of chordae tendonae to the muscles of the ventricle
The AV or atrioventricular valves are the valves which separate the upper chambers (the atria) from the lower chambers (ventricles) of the heart. The AV valve on the left side of the heart is known as the left atrioventricular (AV) valve or the mitral valve. The AV valve on the right side of the heart is known as the right atrioventricular (AV) valve or the tricuspid valve.
The lubb sound is produced when the atrioventricular valves (AV) in the heart close. These valves are deep inside the heart and are between the upper (atrial) and lower (ventricular) chambers. The dubb sound is created when the sinoatrial valves(SA)close. These valves are at the top of the heart and lead to the arteries that carry blood to both the lungs or the body.
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…
The flow through the heart is controlled by the pumping action of the heart and the four valves. The heart has a series of one-way valves that prevent backflow during contraction. AV valves prevent backflow from the ventricles into the atria, and semilunar valves prevent backflow from the aortic and pulmonary trunks into the ventricles.
Semilunar Valves In a normal adult, there are two normal heart sounds associated with the heartbeat. These heart sounds are often described as a "lub" and "dub". The first heart sound is produced by the closing of the AV (atrioventricular) valves. The second heart sound is produced by the closing of the semilunar valves.
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.
Both AV valves, the bicuspid and tricuspid, (separating the ventricles from the atria) prevent blood from flowing back into the atria when the ventricles contract. Both the semilunar valves (separating the arteries from the ventricles) prevent blood from flowing back from the arteries once it has been pumped out of he ventricles, and thus, out of the heart. The difference is that the AV valves are contracted when they are CLOSED, but the semilunar valves…