File:Asthma before-after.png

Skildring
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.In The matter of fact this is not important to be studied!!!!

Image from a FDA newsletter: http://www.fda.gov/fdac/features/2003/203_asthma.html Uploaded from