RESPIRATORY SYSTEM

B. Nose. 1. Has two nostrils (nares) or openings through which air enters. 2. Nasal septum: partition or wall of cartilage divides the nose into two hollow spaces called nasal cavities. 3. Nasal cavities. a. Lined with a mucous membrane. b. Have a rich blood supply. c. As air enters the cavities, it is warmed, filtered, and moistened. d. ................
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