BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Lung tissue. Light micrograph of a cross section through lung tissue and bronchioles. Making up most of the frame (spongy appearance) are tiny air passages called alveoli. These are lined with epithelium (pink) that is rich in capillaries so that gas exchange can take place. At bottom right and bottom left are bronchioles lined with ciliated columnar epithelium (purple, folded). These are the small tubes from which the alveoli open. A larger blood vessel can be seen above the right hand bronchiole (pink, round). Haematoxylin and eosin stained. Magnification unknown.
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