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The nasal passages function as a filter and air conditioner to protect the lower airways. This functionality is achieved by the complex, narrow, convoluted, and .Nasal polyps are soft, painless growths inside the nasal passages. They often occur in the area where the upper sinuses drain into your nose where your eyes, nose, and cheekbones meet . runny nose. postnasal drip, which is when excess mucus runs down the back of your throat..
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Nostril Wiktionary
Either of the two orifices located on the nose or on the beak of a bird used as a passage for air and other gases to travel the nasal passages.