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first heart sound

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Medical Dictionary

first heart sound n.
The heart sound that occurs with ventricular systole and is produced mainly by closure of the atrioventricular valves.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Heart sounds
Get the Answers You're Looking For. Heart sounds
www.RightHealth.com
Sound Hearts
Sound Hearts Online. Shop Target.com.
www.Target.com
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