Lungs, CT scan
Coloured 3D computed tomography (CT) scan of the lungs (pink) from the front. The trachea (windpipe, top centre) can be seen branching into the bronchi, which further branch into bronchioles. The lungs are the site of gaseous exchange, where carbon dioxide is removed from the blood and oxygen is added., by VSEVOLOD ZVIRYK/SCIENCE PHOTO LIBRARY
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