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Air comes into the body through the nose. As it passes over the specialized cells of the olfactory system, the brain recognizes and identifies smells. Hairs in the nose clean the air of foreign particles. The most common medical condition related to the nose is nasal congestion..Filtering of the air by nasal hair in the nostrils prevents large particles from entering the lungs. The area of olfactory epithelium, in the upper nasal cavity contains specialised olfactory cells responsible for this function. The nose is also involved in the function of speech..
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