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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 is occupied to a large extent by nasal conchae. These are turbinate bones which project into the nasal cavity with the purpose of supporting the olfactory mucus membranes and increasing the respiratory surface area, creating turbulence within the passing air.