The nasal mucosa contains a large number of blood vessels that warm the passing air. The upper layer of the nasal cavity membrane is formed by the cells of the ciliary epithelium, due to which the air is humidified and cleaned by cilia from dust particles. The glands of the mucous membrane secrete special bactericidal substances, and on the surface of the mucous membrane there are a large number of leukocytes, which also destroy bacteria. Thus, the air in the nasal cavity is cleared of many bacteria.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.