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The upper quadrants of the heart are called atria. The right atrium receives the deoxygenated blood that has been circulated throughout the body. This blood then moves through the right ventricle and to the lungs to be oxygenated. This blood then returns to the left atrium, goes through the left ventricle, and into the aorta. The aorta then branches off and circulates through the entire body to bring oxygen to the cells and tissues.

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