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epidermis
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epidermis

Outermost layer(s) of cells on an organism's body. In plants and many invertebrates such as insects, it consists of a single layer of cells. In vertebrates, it consists of several layers of cells.

The epidermis of plants and invertebrates often has an outer noncellular cuticle that protects the organism from desiccation.

In vertebrates, such as reptiles, birds, and mammals, the outermost layer of cells is dead, forming a tough, waterproof layer, which is sloughed off continuously or shed periodically.



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That hydration will promote the growth of collagen, boost elastin production, increase the flow of oxygen to the upper epidermis and help your skin cells rejuvenate faster.
The biological process of cutaneous absorption involves a system in which cosmetic active diffuses through the upper epidermis barrier from compartment one (absorption site) to the compartment two (few upper epidermis layers).
Did you realise a fine coating of foundation, far from making you old and spotty (as no doubt your mother explained when you attempted to attend the third year prize giving made up as Tootsie), actually protects your upper epidermis from the corroding effects of pollution?
 
 
 
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