Define tissue damage and skin cancer. What action do Ultra Violet rays have on the skin?
The cumulative effects of exposure to UVA can cause tissue damage which results in an alteration to the skin structure leading to wrinkles, collagen and elastin fiber fragmentation and hyper-pigmentation as well as free radical damage causing imbalances and mutations which then bring about skin cancer. UVB rays cause a thickening of the epidermis and may also contribute to premature skin aging. There are two types of UVA rays, long and short UVA rays. Unprotected exposure to the sun can lead to UV-induced skin damage. UVA and UVB rays may increase the risk of skin cancer. UVA rays can diminish the skins natural protective mechanism.
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