A nose is a protuberance in vertebrates that houses the nostrils, or nares, which receive and expel
air for respiration alongside the mouth. Behind the nose are the olfactory mucosa and the sinuses. Behind the nasal cavity,
air next passes through the pharynx, shared with the digestive
system, and then into the rest of the respiratory system. In humans, the nose is located centrally on the
face and serves as an alternative respiratory passage especially during suckling for infants.