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638062 tn?1224727372
Mucous
What causes mucous in your lungs trachea and mouth????????

Kelly
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554959 tn?1216064566
There are mucus producing cells within the lining of our respiratory and digestive tracts.  The mucus produced protects the underlying tissue and works to remove irritants and foreign particles.  The production of mucus is part of the normal functioning of the body.
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