Smell is the body’s ability to sense odors dispersed in the air. What should be the nasal cavity for normal odor perception? Why? With the help of smell, a person controls air quality. When a pleasant smell appears in the air, a person breathes deeper, and when he feels an unpleasant smell, on the contrary, as rarely as possible. What is the reason for this?
1) the cavity must be moist and clean;
2) moist, because the receptors are irritated by substances dissolved in the mucus of the nasal cavity, clean – the abundant secretion of mucus prevents the access of substances to the olfactory receptors;
3) an unpleasant odor in the air signals a danger (gas leakage, smoke), a person must protect himself from the ingress of toxic substances into the body and therefore breathes less frequently.
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.