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Lung lining. Coloured scanning electron micrograph (SEM) of a section through epithelial cells of the bronchus (lung airway). The cells are covered in cilia, tiny microscopic hairs. Rhythmic movements of the cilia serve to move mucus and trapped particles away from the gas-exchanging parts of the lung, and towards the throat, where they can be expelled. Magnification: x2250 when printed at 10 centimetres wide.
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