why does the epidermis does not have blood vessels?
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Remember that there are no blood vessels in the epidermis so the cells get their nutrients by diffusion from the connective tissue below, therefore the cells of this outermost layer are dead. Stratum Corneum cells flake off. This is known as dandruff and there can be 40 pounds of it produced in a lifetime
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As there is no direct blood supply to the epidermis, this outermost layer of the skin relies on the underlying dermis, for the supply of nutrients and disposal of waste products. This occurs via a process of diffusion through the dermo-epidermal junction, which lies just below the stratum germinativum of the epidermis.
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