Coloured SEM of mucus and cilia in the trachea

Coloured SEM of mucus and cilia in the trachea

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Credit: J. L. CARSON, CUSTOM MEDICAL STOCK PHOTO/SCIENCE PHOTO LIBRARY

Caption: Tracheal epithelium. Coloured scanning electron micrograph (SEM) of mucus (grey) and cilia (pink) on the lining (epithelium) of the human trachea. Specialised cells in the trachea, or windpipe, produce mucus, which traps airborne irritants such as bacteria, pollen and dust. Rhythmic movements of the 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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Keywords: anatomy, cilia, cilia and mucus, epithelium, human body, mucus, respiratory system, trachea, trachea epithelium, tracheal epithelium, windpipe

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