Image: Asthma before-after-en
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Description: During an asthma episode, inflamed airways react to environmental triggers such as smoke, dust, or pollen. The airways narrow and produce excess mucus, making it difficult to breathe.
Title: Asthma before-after-en
Credit: Vectorized in Inkscape by Mysid from http://www.fda.gov/fdac/features/2003/203_asthma.html
Author: FDA/Renée Gordon; vectors by Mysid.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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