HELENE FOURNIE , ISM / SCIENCE PHOTO LIBRARY HELENE FOURNIE , ISM / SCIENCE PHOTO LIBRARY
Artwork of an asthmatic bronchus (at left) versus a healthy bronchus of the lungs. In asthma, a chronic respiratory disease, the bronchi (airways) become narrowed following contraction of the muscle layer and swelling of the mucous lining, leading to impaired breathing. Asthma may be associated with an allergy.
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