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The nasal septum is the wall that divides the nasal cavity into left and right passages. This septum is composed of cartilage and bone. The nose itself is the external part of the nasal cavity and serves as the entrance to the respiratory tract. It filters, warms, and moistens inhaled air before it reaches the lungs. The nasal cavity also contains olfactory organs responsible for the sense of smell. Within the nasal cavity, bony ridges called nasal conchae (or turbinates) increase the surface area, further aiding in air conditioning.123

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