The Skin structure

by on March 9, 2009

The skin is our main organ that main organ that is involved when it comes to issues concerning beauty, touch, pleasure and sensuality. On the average the skin of a human being covers and area of 12 to 20 square feet, and this makes 12% to 16% of the body’s weight. As we grow older, the subcutaneous (under-the-skin) fat gets depleted and this causes the skin to appear looser.

The following is how the skin is composed chemically:

Water 70.0%
Protein 25.5%
Lipids 2.0%
Trace Minerals 0.5%
Other 2.0%

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The skin’s barrier plays two different roles. First the skin must prevent the entry of microorganisms, and prevent the loss of fluid and drying up of the skin. Its ability to allow the exchange of heat, air and fluid, however, depends on its permeability. It also coordinates the sense of touch, and helps to regulate body temperature through the process of water evaporation. The skin is renewed every 27 days, and the continuous replacement leads to the production of a horny protective cover made up of hardened proteins, whiles it discards the layer of dead cells.

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Structure of Skin: Epidermis, Dermis, and Subcutis

Technically, the skin consists of three layers. These are:

epidermis (“overskin”) or top layer
dermis (“skin”) or middle layer
subcutis (“underskin”) or bottom layer

The epidermis is made up of hard and compressed dead cells. The cells under the epidermis are living cells which are larger and at deeper layers of the skin, the skin has larger round cells. New cells grow at the bottom and push upward to the surface. In the process of coming to the surface, the cells flatten up and their water content rescues due to pressure and dehydration.

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How does skin aging take place

UV rays induce the production of radical oxygen species (ROSs) and matrix metalloproteinases (MMPs) within the cells of the body exposed to the UV rays. These factors are the root of wrinkle formation because they destroy the collagen matrix in the dermis.

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