Health The skin in the rays of the sun | The skin in the rays of the sun |
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| Written by Administrator | |
| Sunday, 30 August 2009 | |
 UV radiation is emitted by the sun or from artificial sources. Solar radiation can cause severe reactions - occurring immediately after exposure (sunburn, stroke) or in several hours or days later (hyperpigmentation early and late).
Solarium of the erythemal response of skin could be immediate and reversible after a few minutes or begin a few hours after sun exposure and reach peak at 8-24 hours. Often accompanied by tenderness, swollen skin. As a result of repeated exposures arise so. chronic reactions skin lesions and skin cancer. Leather persistent action of sunlight is bold, it becomes harsh and inflexible, and eventually, after a long-time visibility, and is about to disappear. Formed deep wrinkles and furrows, and various types of stains. The most characteristic and peculiar changes relate to connective tissue. They consist of degeneration and disintegration of collagen fibers, elastin and accumulation of crumbling properties, twisted substances in the upper layers of the skin. These processes are defined as skin. Changes appear also in the microcirculatory skin. Superficial vessels become wider and more crooked, create telangiectasia, are easy to break. Our skin is under the influence of the sun and various types of discoloration. The most common changes include freckles, spots, color and focus solar lesions and cancers Color figures. Ultraviolet radiation can also directly damage the DNA in skin Langerhans cells, and also to affect the repair enzymes responsible for repair of DNA. Calling the state of immunosuppression is one of the important factors which could facilitate the process. Until recently it was thought that only UV-B is responsible for a possible stimulation of malignancy. In recent years, also highlights the possible role of UV-A exposure has increased considerably because of the extent of radiation. Specific risk adverse effects of UV-A also increased due to more frequently and willingly used artificial light sources, which are used both for therapeutic purposes (phototherapy) or cosmetic (tanning). Sunlight on the skin depends on many factors : - wavelength - radiation intensity - exposure time - frequency of exposure - exposure conditions, such as the angle of incidence of rays - ontogenic response, or color of skin and surrounding irradiation It should be noted that various factors are changing the reaction of skin to UV radiation, for example, internal diseases, the substances used topically or generally increase skin sensitivity to ultraviolet radiation, genetic predisposition, and previous treatment with X-ray radiation. |
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| Last Updated ( Tuesday, 15 September 2009 ) |
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