Concept
Version 12
Created by Boundless
Asthma
Alveolar Effects of Asthma
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.
Source
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"Asthma before-after-en."
http://commons.wikimedia.org/wiki/File:Asthma_before-after-en.svg
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