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- 18:16, 9 August 2010 S8600021 talk contribs uploaded File:Fetal heartbeat 01.mp3 (==Human Fetus (17 week) heart beat== The characteristic "lub-dup" sounds are associated with closing of heart valves. The first sound (lub) occurs as atrioventricular valves close and signifies beginning of systole (contraction) The second sound (dup) )
