Definition of Right atrium
Right atrium: The right upper chamber of the heart. The right atrium receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle which then sends it to the lungs to be oxygenated. 
http://www.medterms.com/script/main/art.asp?articlekey=26566 Last Editorial Review: 6/14/2012
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