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Which of the following statements about blood circulation in the body is true?A. Deoxygenated blood flowing through the pulmonary veins is carried to the right atrium.B. During one cardiac cycle, the two ventricles contract first, and then the two atria contract.C. As the right ventricle contracts, it sends oxygenated blood through the aorta to all tissues of the body.D. Valves prevent the backflow of blood into the atria and ventricles.

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