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organ system that includes har, skin, and nails and protects the body from pathogens and maintains homeostasis
older cells harden in this process, process by which the cells of epidermis become filled with keratin and move to the surface, where they are sloughed off
secrete sebum (oil) into the hair follicles where the hair shafts pass through the dermis
most abundent sweat glands, respond throught life to body temperature elevated by environmental heat or physical exercise.
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