Thursday, 27 April 2017

Tanning of the skin

UVA radiation is what makes people tan. UVA rays penetrate to the lower layers of the epidermis, where they trigger cells called melanocytes to produce melanin. Melanin is the brown pigment that causes tanning. Melanin is the body's way of protecting skin from burning.Sun tanning or simply tanning is the process whereby skin color is darkened or tanned. It is most often a result of exposure to ultraviolet (UV) radiation from sunlight or from artificial sources, such as a tanning lamp found in indoor tanning beds. Some people tan or sunburn more easily than others. A suntan results from the body's natural defense mechanism kicking in against damaging ultraviolet sun rays. When the defenses are overwhelmed, a toxic reaction occurs, resulting in sunburn. The defense mechanism is a pigment called melanin, which is produced by cells in our skin called melanocytes. Is there such as thing as a healthy tan? Simply put, no. There is no degree of tanning, whether from natural sunlight or artificial light, like tanning beds, that can be considered safe. Damage to your skin from the sun and tanning beds can happen in just minutes from exposure to ultraviolet rays.

Information from:
http://kidshealth.org/en/teens/tanning.html
https://en.wikipedia.org/wiki/Sun_tanning
http://www.livescience.com/38039-what-causes-sunburns.html
https://consults.blogs.nytimes.com/2009/06/03/is-there-such-a-thing-as-a-healthy-tan/?_r=0

Image from:
http://www.tantropics.com/how_skin_tans.htm

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