bsc chronicle pdf Published this article page no 51 significance of a broad-spectrum sunscreen cannot be over-emphasized. UV-B and UV-A rays have varied affects on your skin, your immune system, and your body as a whole. UV-B irradiation disrupts the melanocytes (the cells deep beneath the epidermis of your skin responsible for your pigmentation), causing them to release the “redness” known as sunburn. Any change in the color of your skin as a result of over-exposure to the sun is a sign of damage, even if your skin tends to “tan” as opposed to burn. When this occurs, your melanocytes are trying to tell you that normal, healthy cells have been severely disrupted and therefore are attempting to compensate for that damage. On the other hand, damage to your skin caused by UV-A irradiation is far more serious. UV-A rays are especially harmful as they penetrate deeper, breaking bonds of DNA which lead to cancer. You typically do not see the immediate effects of UV-A rays, but they are the chief culprit behind photo-aging and wrinkling in addition to actinic keratoses, a pre-cancerous skin condition. Damage to your cells as a result from over-exposure to ultraviolet radiation from the sun or from a tanning bed is un-repairable bsc academy monthly magazine buy.
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