Newspaper the Daily Mail published a clarification of the specialist the University of Queensland David king regarding the mechanism of common human reactions to the cold. The fact is that according to the observations of physicians, about 90% of the planet's inhabitants face a problem when at low temperatures from the nose begins to "flow". The scientist explained the process of automatic reaction, in which the inhaled the frosty air entering into the nasal space becomes warm and moist, protecting from irritation when the penetration into the lungs.
Standard temperature level in the rear area of the nasal cavity is about 26 degrees, with the possibility of increasing up to 30 degrees if necessary. Conventional constant humidity in the nasal cavity is 100%. When injected into the nose cold, dry air in brain structure receives a signal that causes increased blood flow to the nose-space for quick heating of inhaled air. At the same time, increases the production of mucus, moistening the air.
In addition, cold dry air stream activates the body's immune system, which functions in the nose perform the fat cells to produce more liquid substance. As a result of loss of fluid of the human body through the nose can reach 400 ml per day. Since the evaporation process is provided by thermal resources new cavity, the blood flow to it increases, performing a high priority task of warming the inhaled air.
The increased activity of the condensing mechanism causes the formation of excessive moisture in the nose. Since fat cells immune system is most sensitive with allergies and asthma, and changes in the vessels peculiar to the people, sensitive to external irritants and changes of the background temperature, often cold air flows cause congestion in the nose and sneezing.