oa SA Pharmacist's Assistant - Postnasal drip explained : review
The purpose of the nose is to warm, clean and humidify the air that is breathed in, as well as to facilitate the senses of smell and taste. Glands in the nose produce mucus that assists these functions by trapping inhaled foreign particles. Tiny microscopic hairs (cilia) line the surfaces of the nasal cavity, helping to brush away particles. The mucus is moved to the back of the throat, where it is swallowed.
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