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1) The major blood vessels connected to your heart are the aorta, the superior vena cava, the inferior vena cava, the pulmonary artery
2) The pulmonary veins carry oxygenated blood from the lungs into the left atrium where it is returned to systemic circulation. The aorta is the largest artery in the body. It carries oxygenated blood from the left ventricle of the heart into systemic circulation.
3) The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.
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