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the conchae and nasal mucosa function during inhalation to filter, heat, and moisten the air. during exhalation, they reclaim this heat and moisture. the inhaled air cools the conchae, and then during exhalation these cooled conchae precipitate moisture and extract heat from the humid air flowing over them.
The nasal cavity also has the nasolacrimal duct, which serves to drain tears from the eyes and out the nose. The nose passages have to Conchae on either side. These help increase the surface area to which air is exposed. The sinuses within the skull are able to drain through the nasal passage.