MICHAEL GABRIDGE, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY MICHAEL GABRIDGE, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Tracheal epithelium. Coloured scanning electron micrograph (SEM) of cilia (blue) on the lining (epithelium) of the human trachea, or windpipe. Specialised cells in the trachea produce mucus, which traps airborne irritants such as bacteria, pollen and dust. Rhythmic movements of these hair- like cilia serve to move the mucus away from the gas-exchanging parts of the lungs, up the trachea and towards the throat where it can be swallowed or coughed up. Magnification unknown.
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