EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
An illustration of the heart and its network of pulmonary arteries and veins. Deoxygenated blood returns to the heart and is transported to the lungs via the pulmonary arteries. Blood returns to the heart from the lungs through the pulmonary veins, where it will eventually travel through the aorta to supply the body with oxygenated blood.
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