The sound of lubb is produced during closure of
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Heart sounds are the noises generated by the beating heart and the resultant flow of blood through it.
In healthy adults, there are two normal heart sounds often described as a 'lubb' and a 'dubb' (or 'dupp'), that occur in sequence with each heartbeat. These are the first heart sound and second heart sound, produced by the closing of the AV (atrio ventricular) valves and semilunar valves, respectively.
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