BSIP, GONDELON / SCIENCE PHOTO LIBRARY BSIP, GONDELON / SCIENCE PHOTO LIBRARY
Lung bronchi. Coloured 3D computed tomography (CT) scan of the main airways of the lungs (purple) and the back of the heart (yellow/orange). Seen from behind, the trachea (windpipe) descends into the chest and passes behind the heart. It divides into two bronchi at the level of the pulmonary arteries (yellow), blood vessels that take blood to the lungs to obtain oxygen. Each bronchus forms one of the lungs, branching into thinner airways (bronchioles, not seen). The heart is a hollow muscular organ that pumps blood round the body. CT scanning uses multiple X-ray beams to scan the body from different angles. Computers create a 3D image of the area scanned.
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