Usefulness of skin

Usefulness of skin in each layer

A layer of acid (acid mantle or acid barrier)         
        On the surface there is a layer horn layers of defense that are fatty acids and is known as the acid mantle. The degree of acidity (pH) of this layer ranges between 5-6 and therefore can inhibit the growth of germs, fungi and yeast skin surface. This layer is a mixture of sweat (containing salt, lactic acid, urea, ammonia); Pallid (fatty acids) and cells horns terkalupas

The formation of skin pigment       
        Skin color among others determined by the amount of melanin pigment in the skin. Melanin is formed by the cells of the lymph in the seed layer, the grains were brought to the layers of the epidermis is more shallow and well into the skin Jangkang. The granules of melanin in the skin Jangkang protoplasm contained in cells called melanofor.       
        Melanin is made from tyrosine, an amino acid. By oxidation of tyrosine is converted into melanin grains are brown. For this process Pertu the enzyme tyrosinase and oksigin. Oxidation of tyrosine into melanin run more smoothly at high temperature or under the influence of ultraviolet light.

Tools byproduct of the skin (skin adnexal) 
These tools come from the epidermis, but has changed its form:- Sweat glands,- Pallid gland,- Nails,- Hair,

Sweat glands

There are two kinds of sweat glands:
1. The eccrine sweat glands: the largest throughout the body, mostly on the palms and soles of the feet, that are acidic sweat, comes down through the channel length of the pores of sweat. 
2. The apocrine sweat glands: only made in the underarm skin, the skin around the nipples and pubic area of ​​skin; issued Keringant containing parts of the gland cells (easily broken, becomes smelly), weakly alkaline nature, empties into the hair follicle.Pallid glandsPallid glands located on top of the cuticle of the hair close to the content and empties into the content of the hair. These glands form Pallid (Sabum) or a skin ointment.

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