Integumentary System * The effects of photoaging accumulate over years of chronic sun exposure. * At first, the effects may be invisible to the casual glance, even while they are on the increase. * Photos taken with ultraviolet light will dramatically reveal the accumulative effects of chronic sun exposure. * In the following series of photos the accumulative effects of chronic sun exposure are clearly seen. * In each set of photos, the two pictures on the left were taken in ordinary light, the picture on the right in ultraviolet light: Tanning * Tanning only occurs after DNA damage has already occurred * Essentially, DNA damage is the trigger for the tanning response, meaning that tanning doesn't begin until you have done at least some damage, leading to the conclusion that there really is no safe level of sun exposure. * This damage is cumulative with time and the magnitude of the exposures. * Over the years, total time in the sun is reflected by wrinkles, blotchy pigmentation, and
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This note was uploaded on 01/29/2012 for the course SCIE SYG2000 taught by Professor Bernhardt during the Fall '10 term at Broward College.