when the first heart sound start?
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Explanation:
First Heart Sound (S1) The first heart sound results from the closing of the mitral and tricuspid valves. The sound produced by the closure of the mitral valve is termed M1, and the sound produced by closure of the tricuspid valve is termed T1.
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Answer:
First Heart Sound (S1) The first heart sound results from the closing of the mitral and tricuspid valves. The sound produced by the closure of the mitral valve is termed M1, and the sound produced by closure of the tricuspid valve is termed T1.
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