MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The LUBB (first heart sound) is caused by ____
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Atria contracting
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AV valves shutting
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Ventricles contracting
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Semi lunar valves shutting
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Explanation:
Detailed explanation-1: -The heart tone “lub, ‘’ or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole. The heart tone “dub, ‘’ or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.
Detailed explanation-2: -The first heart sound, the “lub” sound, is produced during the closing of the two atrioventricular valves. There are two atrioventricular valves in the heart, namely: bicuspid and tricuspid valves.
Detailed explanation-3: -Due to the closure of the atrio-ventricular valves, dup sound is produced.
There is 1 question to complete.