Bronchial cilia. Coloured scanning electron micrograph (SEM) of a normal human bronchial epithelium, the mucus membrane lining the major airways of the lung. Clumps of hair-like cilia (purple/blue) protrude from the tops of specialised epithelial cells (brown/green). Rhythmic movements of the cilia serve to move bacteria and other particles away from the gas- exchanging parts of the lung and towards the throat, where they can be expelled. Magnification unknown.

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