Allergens, such as dust, pollen, and smoke, trigger airway inflammation, leading to an increase in mucus secretion. The mucus binds up the allergens and, in a process known as mucociliary clearance, ejects the allergens from the airway. Mucus is formed when dehydrated mucin molecules mix with free water in the airway. Mucus production is required to protect the airway, but in certain inflammatory airway diseases, too much mucus is produced, leading to difficulty in breathing. Mucus production is partially controlled by the number of water molecules in the airway...
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