# health

What action makes the sound of the heart beating?

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1. http://www.myuniversalfacts.com/2005/08/what-causes-sound-of-your-heart-beat.html

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2. Is the answer lub dub

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3. No. That's the sound. It doesn't tell WHAT makes the sound.

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4. Watch and listen to this video.

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

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