MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The first heart sound is associated with closure of the ____ valves.
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bicuspid and mitral
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bicuspid and aortic
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aortic and tricuspid
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bicuspid and tricuspid
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Explanation:
Detailed explanation-1: -During each cardiac cycle two prominent sounds are produced-lub and dub. The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas the second heart sound (dub) is associated with the closure of the semilunar valves .
Detailed explanation-2: -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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