Heart and lungs. Coloured computed tomography (CT) scan of the human chest showing a healthy heart and pair of lungs (axial view from below). At lower centre, the heart is seen (green) with its major blood vessels. On either side are the lung fields (black). At above centre is a vertebra of the spine (black and red) with the spinal cord (blue) visible within it; ribs of the ribcage surround the lungs (black and red). Between the vertebra and the heart is the circular aortic artery, and to its right the oesophagus.
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