Asked by joy

What action makes the sound of the heart beating?

Answer : lab dub .Is it right?
Answered by Ms. Sue
No. Watch and listen to this site.

http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html
Answered by joy
Closing of valves
Answered by Ms. Sue
Right.
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