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Aorta and lung airways. 3D computed tomography (CT) scan of parts of the aorta (red), with lung tissue and airways (blue and green) also shown. The aorta is the body's main artery, distributing oxygenated blood from the heart-lung system to the rest of the body. (KEYSTONE/SCIENCE PHOTO LIBRARY/VSEVOLOD ZVIRYK/SCIENCE PHOTO LIBRARY)