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In healthy adults, there are two normal heart sounds, often described as a lub and a dub (or dup), that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2), produced by the closing of the atrioventricular valves and semilunar valves, respectively.The” lub” is the sound of the tricuspid and mitral valves closing. The” DUB” is the sound of the aortic and pulmonary valves closing. Together, they’re the sound of someone’s heart doing its job. The distinctive sound of the heartbeat-lub-dub, lub-dub, lub-dub comes from the closure of two pairs of heart valves.
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