The circulatory system is a network of blood vessels carrying blood to and from the heart and lungs.Arteries, shown in red, carry oxygenated blood from the heart to the body.Veins, shown in blue, return the blood back to he heart. Capillaries, also shown in red, are tiny blood vessels distributing oxygen-rich blood to the body. Illustration from 'The Household Physician' 1908
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