The skin - or to use the correct term, cutaneous membrane - is the largest organ in the human body. There are about two square metres of it covering an average adult and it accounts for about an eighth of the total body weight. It's the body's first line of defence against a hostile environment, being waterproof (from both directions) and germ-proof. It also acts as a temperature control mechanism and the main access to one of the senses - touch.
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