Question

when are the sounds lubb and dup produced in the heart ? brief answer related to valves please.

Answer 1

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Answer: The “ lub” is the first heart sound, commonly termed S1, and iscaused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The secondsound,” dub” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.




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