Coloured SEM of tracheal epithelium

Coloured SEM of tracheal epithelium

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Trachea. Coloured scanning electron micrograph (SEM) of epithelial cells lining the trachea (windpipe). Some of the cells are covered in cilia (green), while others have tiny microvilli (purple) which increase the surface area of the trachea. The epithelium is covered in mucus which traps large dust particles and removes gaseous pollutants such as ozone and sulphur dioxide from inhaled air. The cilia beat rhythmically, filtering particles suspended in the incoming air, and sweeping dust and other foreign material back towards the larynx. Magnification unknown.

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Keywords: anatomy, cilia, epithelium, human body, images, magnified image, microscopic photos, microvilli, respiratory system, subjects, trachea, trachea epithelium, windpipe

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