لخّصلي

Would you be enticed by an advertisement for a coat that is waterproof, stretchable, and washable; that invisibly repairs small cuts, rips, and burns; and that is guaranteed to last a lifetime with reasonable care?Sounds too good to be true, but you already have such a coat-your cutaneous mem-brane, or skin.Skin is absolutely essential because it maintains your bodys boundary.(This is why you can swim for hours without becoming waterlogged.) Structurally, the skin is a marvel.

Would you be enticed by an advertisement for a coat that is waterproof, stretchable, and washable; that invisibly repairs small cuts, rips, and burns; and that is guaranteed to last a lifetime with reasonable care? Sounds too good to be true, but you already have such a coat-your cutaneous mem-brane, or skin.
Skin is absolutely essential because it maintains your bodys boundary. It keeps water and other precious molecules in the body and keeps excess water
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(and other things) out. (This is why you can swim for hours without becoming waterlogged.)
Structurally, the skin is a marvel. It is pliable yet tough, which allows it to take constant punishment from external agents. Without our skin, we would quickly fall prey to bacteria and perish from water and heat loss.
The skin and its appendages (sweat and oil glands, hair, and nails) are collectively called the integumentary (in-teg"u-men'tuh-re) system. Let's take a look at the structure and function of this often underappreciated body system.