BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY
Heart and lungs. Coloured computed tomography (CT) scan of a human chest showing a healthy heart (blue, upper right) and pair of lungs (4, brown). This is a horizontal (axial) CT scan looking up the body. Three of the heart's four chambers are seen: the right ventricle (1), the left ventricle (2) and the right atrium (3). The heart pumps oxygenated blood to the lower parts of the body through the descending aorta (5). At lower centre is a vertebra (6) of the spine, inside which is the spinal cord (yellow). Ribs (blue) of the ribcage surround the lungs.
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