The hollow cavities of the paranasal sinuses act as sound chambers that modify and amplify speech and other vocal sounds. Nasal vowels and nasal consonants are produced in the process of nasalisation. The nose is also involved in the function of speech. ![]() The area of olfactory epithelium, in the upper nasal cavity, contains specialised olfactory cells responsible for this function. Sneezing can transmit infections, because aerosols are created in which the droplets can harbour pathogens.Īnother major function of the nose is olfaction, the sense of smell. Sneezing is a reflex to expel unwanted particles from the nose that irritate the mucosal lining. 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 nasal mucosa lining the nasal cavity and the paranasal sinuses carries out the necessary conditioning of inhaled air by warming and moistening it. The nose has an important function in breathing. 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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