BSIP, GILLES / SCIENCE PHOTO LIBRARY BSIP, GILLES / SCIENCE PHOTO LIBRARY
Lung epithelium. Artwork showing cells lining a bronchus in a lung. A bronchus is a large airway which divides into bronchioles deeper in the lungs. The bronchi are lined with mucus (pale blue, top), which is secreted by glands in the tissue (one sectioned at lower left). This helps to trap microorganisms and foreign bodies. In the wall of the bronchus are supportive collagen fibres (banded brown/yellow strands), structural protein fibres which are produced by fibroblasts (green/blue, one at bottom left). Also in the bronchus wall are macrophage white blood cells (pale blue with purple spots), which digest invading organisms.
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