People like to wear masks when they go out in autumn and winter. What are the advantages and disadvantages of wearing a mask?

Benefits: Masks can prevent dust and sand from entering the mouth, and belts can also prevent the flow of germs. In hospitals, you can see that almost all doctors and nurses in infectious wards, medical rooms or operating rooms wear masks, and they can also be worn in cold weather to prevent their noses from freezing.

Disadvantages: If the air quality is good, the mask will affect the inhalation of fresh air, and long-term wearing will also have a certain impact on breathing. When oxygen is filtered through the mask, it will inevitably contaminate the bacteria of the mask itself, that is, the harmful bacteria filtered out before. Masks are only suitable for short-term protection against dust and epidemic bacteria.

? Some people wear masks to keep out the cold all day in winter, which actually reduces people's ability to keep out the cold. There are many blood vessels in the nasal cavity, and there are many spongy vascular networks, which make the blood circulation in the nasal cavity vigorous. The nasal cavity and the whole respiratory tract are covered by many mucous membranes, and there are microvessels under the mucous membranes. When cold air is inhaled by the nose and enters the lungs through a winding pipe, the temperature of the air is close to body temperature.

This physiological function of human body can be enhanced through exercise, thus improving people's cold tolerance. If you wear a mask all day, the nasal mucosa and the whole respiratory tract will not get exercise, and you will catch a cold if you have a slight cold. Some people like to use scarves as masks. The raw materials of scarves are mostly wool and chemical fiber fabrics. If you put a scarf on your mouth, fibers and bacteria will be inhaled into your lungs when you breathe, which is very harmful to human health.

Moreover, the scarf is used as a mask, and the position of the scarf is raised, which is easy to make the neck cold. Of course, it is necessary to wear a mask when walking in the wild, in order to prevent wind, sand and cold, or to move in an environment with air pollution, but the time should not be too long.

Combined with the above statement, the advantage of wearing a mask is that it can prevent dust from entering the mouth, but the disadvantage is that if you wear a mask for a long time, the bacteria left on the mask will enter the mouth, which is not good.