AMI IMAGES / SCIENCE PHOTO LIBRARY AMI IMAGES / SCIENCE PHOTO LIBRARY
Bronchial epithelium. Coloured scanning electron micrograph (SEM) showing cilia (tiny microscopic hairs) on the lining of a bronchus (airway). 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 by coughing, or swallowed.
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