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The heart and all the arteries and veins, and the lungs make up the circulatory system.

The heart pumps oxygenated blood around the body through the aorta, and deoxygenated blood returns to the heart through the vena cava. This is the systemic circuit.

At the lungs, small air sacs called alveoli allow oxygen to diffuse into the arteries before going to the heart, and then being pumped around the rest of the body. This is the pulmonary circuit.

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