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One of the two receiving chambers of the heart. The right atrium receives oxygen-poor blood from the body. The left atrium receives oxygen-rich blood from the lungs. The plural of atrium is atria. (Source: excerpt from NHLBI, Facts About Primary Pulmonary Hypertension: NHLBI)
Atria: Upper two of the four chambers of the heart.
Condition count: 2 ; see list below.
Organs: list of all organs
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