PHYSIOLOGICAL EFFECTS OF ULTRA-VIOLET

the skin acts as a protective layer, in that it absorbs most ultra-violet light and prevents its penetration down to vulnerable cells. if ultra-violet waves are absorbed by the skin, the energy they release is sufficient to cause damages, and the consequent reaction, depends upon the wavelength of ultra-violet and the amount of ultra-violet absorbed. UVC and UVB are absorbed in the epidermis, but UVA may penetrate as far as the capillary loops in the dermis .