Letter L

Left atrium

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The upper right chamber of the heart.

The left atrium receives oxygenated blood from the lungs and pumps it down into the left ventricle which delivers it to the body.</P> NTER><IMG height=423 alt='Atrial Fibrillation Illustration' src='http://images.medicinenet.com/images/illustrations/heartxsection.gif' width=489 border=0></CENTER>

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