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Biology 21 Online
OpenStudy (anonymous):

when blood circulates in the body, where does is enter in the heart?

OpenStudy (anonymous):

The right atrium is where oxygen-depleted blood returns. It is then passed the the right ventricle and delivered to the lungs to become oxygenated. The left atrium receives the oxygen enriched blood, and the left ventricle deliver it around the body.

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