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Filtered:-Hair at nostril to trap dust-Mucus at nasal cavity and respiratory tract to trap dust and bacterial(1)Beating of cilia sweep the trapped dust and bacteria towards the throat(1) either cough out or swallow(to be killed by HCl in gastric juice)Moist:Mucus moisten the incoming air (1)Warmed: Heat in blood capillaries warms up the incoming air(1)

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