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What are normal heart sounds caused by?

what are normal heart sounds caused by?
Mon, 14 Dec 2009
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The 'lub- dub' is the sound of your heart valves opening and closing. (S1 or 'lub' ) is caused by closing of the mitral and tricuspid valve as the ventricles begin to contract and pump blood into the aorta +pulmonary artery. The second sound (S2 or 'dub') is caused when the ventricles begin to relax and allow the aortic and the pulmonary valves to close.
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