What is a tan? Detailed answer

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What is a tan? Detailed answer

Big encyclopedia for children and adults

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What is a tan?

People often expose their skin to sunlight to "tan". But few people realize that sunlight has a very significant effect on the skin. The most significant of these effects is sunburn, or reddening of the skin. This is caused by ultraviolet radiation, which converts histidine, a substance found in the skin, into another substance that dilates blood vessels.

This is what causes reddening of the skin. There is another substance in the skin - tyrazine. UV light converts tyrazine into a brown pigment called melanin. Melanin is then deposited in the outer layers of the skin to protect it from further exposure to light rays, and this is what we call sunburn. Sunlight also has a positive effect on the body. It destroys fungi and bacteria that may be on the skin. Sunlight also causes the appearance of a substance in the skin that constricts blood vessels, which leads to an increase in blood pressure.

Exposure to sunlight can also activate certain cells in the body that resist infections. Even the muscles of the body are toned with the help of sunlight. And the nervous system is also stimulated. In addition, the body receives vitamin D because ultraviolet light produces chemical changes that lead to the formation of this vitamin.

Since we have found out that sunlight does so many useful things, does this mean that a person should strive to sunbathe as much as possible? The answer to this question is this: since sunlight acts like a medicine on the body, care must be taken to get a moderate amount of this medicine.

If you are going to tan, then you need to do it gradually: a few minutes during the first day, five minutes more the next day, and so on. If you spend too much time in the sun, it can harm both the skin and the entire body.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Where and when was a bicycle race organized to escape to another country?

In 1915, a group of athletes from the Belgian Liege asked the commandant of the German occupation troops for permission to hold a bicycle race in order to raise funds to help the victims of the war. He agreed on the condition that each participant put a German flag on the bike. The route of the race was assigned from Liège to the village of Molingen near the Belgian-Dutch border. At the finish line, the cyclists did not stop and went straight to the Netherlands, which was a neutral state during the First World War, and the German soldiers guarding the track did not have time to prevent the fugitives.

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