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What is the role of mucus in the nasal cavity?

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The sinus, or nasal cavity, serves to lighten the skull, to produce mucus, to warm and moisturize air breathed in through the nose and to serve as a chamber in which speech resonates. The sinus cavity is made up of four pairs of sinuses. read more

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Remember that the pharynx is at a crossroads from which leads off, at the top, the passage to the mouth cavity and the passage to the nasal cavity, and below, the passage to the larynx.
Source: quotemaster.org