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 heart valves
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firing of the nodes of the intrinsic conduction system
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blood rushing through the chambers
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closure of heart valves
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Detailed explanation-1: -The first sound, a low-pitched, slightly prolonged “lub, ‘’ occurs when the atrioventricular valves close as the ventricles of the heart begin to contract. After a brief pause, this sound is followed by a sharper, higher-pitched “dup, ‘’ produced by closure of the aortic and pulmonary valves.
Detailed explanation-2: -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.
Detailed explanation-3: -This sound comes from the valves shutting on the blood inside the heart. The first sound (the lub) happens when the mitral and tricuspid valves close. The next sound (the dub) happens when the aortic and pulmonary valves close after the blood has been squeezed out of the heart.