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A member asked:
What do lub and dub mean when you listen to your heart?
A doctor has provided 1 answer
You have four: Valves the work together: first sound (lub) is closing mitral and tricuspid valves, the ones separating atria from ventricles (l&r), the dub varies with breating the second sound splits with breathing, as the closure of pulmonic valve and aortic valve are slightly separated.
Answered 9/10/2014
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