The left atrium is one of four chambers (two atria and two ventricles) in the human heart. It receives oxygenated blood from the pulmonary veins, and pumps it into the left ventricle.

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The left atrium is one of four chambers (two atria and two ventricles) in the human heart. It receives oxygenated blood from the pulmonary veins, and pumps it into the left ventricle.
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