MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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opening of the pulmonary and aortic valves
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closure of the tricuspid and bicuspid valves
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closure of the pulmonary and aortic valves
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opening of the tricuspid and bicuspid valves
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Detailed explanation-1: -The second heart sound, called S2, makes a “dub” sound caused by the closure of the semilunar (aortic and pulmonary) valves following ventricular systole.
Detailed explanation-2: -The second heart sound (S2) represents closure of the semilunar (aortic and pulmonary) valves (point d). S2 is normally split because the aortic valve (A2) closes before the pulmonary valve (P2). The closing pressure (the diastolic arterial pressure) on the left is 80 mmHg as compared to only 10 mmHg on the right.
Detailed explanation-3: -The valves are located between the atria and ventricles, and between the ventricles and the major arteries from the heart. Normal heart sounds are called S1 and S2. They are the “lubb-dupp” sounds that are thought of as the heartbeat. These sounds are produced when the heart valves close.