MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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semilunar
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pulmonary
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atrioventricular (AV)
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aortic
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Detailed explanation-1: -"Lub” is the sound of the atrioventricular (AV) or tricuspid and bicuspid valves closing. This occurs at the start of ventricular systole. “Dub” is the sound of closing of the semilunar valves at the root of the aorta and the pulmonary artery. This happens at the beginning of ventricular diastole.
Detailed explanation-2: -The first sound, a low-pitched, slightly prolonged “lub, ‘’ occurs when the atrioventricular valves close as the ventricles of the heart begin to contract.
Detailed explanation-3: -The first sound LUB is produced when the atrioventricular valves i.e. tricuspid and bicuspid valves close at the start of ventricular systole. The second sound DUB is produced at the beginning of ventricular diastole when the pulmonary and aortic semilunar valves close.