Asked by joy

What action makes the sound of the heart beating?
Answered by Ms. Sue
http://www.myuniversalfacts.com/2005/08/what-causes-sound-of-your-heart-beat.html

Answered by joy
Is the answer lub dub
Answered by Ms. Sue
No. That's the sound. It doesn't tell WHAT makes the sound.

Answered by Ms. Sue
Watch and listen to this video.

http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html