SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Vascular system. Historical illustration of the human vascular system showing the positions of the arteries (left). The large body artery (the aorta, red, upper left) branches into smaller arteries that supply oxygenated blood. Several veins are shown carrying deoxygenated blood (blue). Three diagrams show valves: in a vein (upper centre), in the pulmonary artery (upper right) and inside the heart (centre right). Valves prevent the backwards flow of blood. Branches of the pulmonary vein (red) and the pulmonary artery (blue) are seen with an airway of the lung (lower right). Colour lithograph by Fairland from The Vessels of the Human Body, 1837. Based on drawings by J.Swandale.
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