Filtering of the air by nasal hair in the nostrils prevents large particles from entering the lungs. Nasal conchae, shell-like bones in the walls of the cavities, play a major part in this process. ![]() ![]() The main function of the nose is breathing, and the nasal mucosa lining the nasal cavity and the paranasal sinuses carries out the necessary conditioning of inhaled air by warming and moistening it. On average the nose of a male is larger than that of a female. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum which separates the nostrils and divides the nasal cavity into two. ![]() It is also the principal organ in the olfactory system. ![]() It bears the nostrils and is the first organ of the respiratory system. The human nose is the most protruding part of the face.
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