first heart sound is due to
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The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a). S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.
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firdt heart sound is lub
Explanation:
this sound produced by heart on the opening and closing of heart
left article producing first sound
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