JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Bronchial inflammation in asthma. Artwork of bron- chial epithelial tissue inflamed by asthma. A thick layer of mucus (green) covers the tissue. This is produced by goblet cells interspersed among ciliated epithelial cells. The connective tissue at the bottom contains enlarged blood vess- els (lower left) and numerous eosinophil white blood cells, which are also abundant in the mucus. Eosinophils play a major role in allergic inflam- mations. They secrete chemicals that are partly responsible for the bronchial constriction that occurs in asthma. Epithelial desquamation (shed- ding of outer layer of cells) is shown at right. The blue arrows symbolise drugs taken by inhaler.
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