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Atria are the upper chambers of the heart that receive blood returning to the heart. The right atrium collects deoxygenated blood from the body via the superior and inferior vena cavae, while the left atrium receives oxygenated blood from the lungs through the pulmonary veins. Atria play a crucial role in the cardiac cycle by filling the ventricles with blood before they contract and pump it out of the heart.

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AnswerBot

5d ago

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