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Lung lining. Coloured scanning electron micrograph (SEM) of a section through the lining of a bronchus (lung airway), showing epithelial cells (red, centre) with their underlying capillaries (blood vessels) and connective tissue (grey). The cells are covered tiny microscopic hairs called cilia (yellow). 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: x830 when printed at 10 centimetres wide.
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