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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).
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What event within the heart causes the AV valves closed?
It's called systole, but valve closure is a passive event caused by an attempt at retrograde blood flow.
What causes the opening of the heart valves?
pressure gradients.
What action causes audible heart sounds?
The opening and closing of the heart valves.
What causes the lubb dupp heart sounds that are heard while taking a apical pulse?
The closure of mitral and tricuspid valves causes the first heart sound. The second heart sound is produced by the closure of semilunar valves (pulmonic and aortic valves).
What event causes the semilunar to open?
When ventricular pressure exceeds that of the large arteries leaving the heart, the semilunar valves are forced open. (Marieb/9th edition)
What causes the valves to open and close during the heart cycle?
By minute electrical singles produced by the heart itself to open and close the valves.
What causes the heart murmur?
Some murmurs are caused by heart valves that do not close completely.
Fungus that causes the heart muscle lining or valves to be inflamed?
Endocarditis aspergillus fumigatus is the fungus that causes the heart muscle lining and or valves to become inflamed. It is a severe, though rare, complication in cardiological patients.
What cause the lubb-dupp heart sounds that are heard while talking an apical pulse?
The closing of the valves in the heart. The first sound is caused by the closing of the atrioventricular valves within the heart. The second sound is caused by the shutting of the aortic and pulmonary valves.
What happens to A V valves during ventricular contraction?
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.
What causes the lub and dup of the heart?
The lub is caused by the closing of the AV valves. The dup is caused by the semilunar valves closing at the end of systole.
What defect causes a heart murmur?
Incomplete closint of any one of the 4 valves may cause a murmur
