BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Nasal epithelium. Coloured Scanning Electron Micrograph (SEM) of a dense carpet of cilia from the inside of the human nose. These microscopic hair-like structures line the inside of the nose and the respiratory tract. They are covered with a wet, sticky mucus that humidifies inhaled air and traps dust particles and other air pollutants. Co-ordinated, wave-like beating of the cilia prop- els the mucus to the back of the nose (pharynx), where it is swallowed and inactivated by the stomach. Magnification unknown.
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