SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Nasal lining. Coloured scanning electron micrograph (SEM) of cilia covering the epithelial lining of the nasal cavity. These microscopic hair-like structures are covered with a sticky mucus (not seen) that traps dust and other inhaled particles. Co-ordinated, wave-like beating of the cilia propels the mucus to the back of the nose (pharynx), where it is swallowed.
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