Saturday, 28 January 2017

The structure of hair

Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft. The hair is made up of 95% keratin, a fibrous, helicoidal protein (shaped like a helix) that forms part of the skin and all its appendages (body hair, nails, etc.).
Keratin is synthesized by keratinocytes and is insoluble in water, thus ensuring impermeability and protection for the hair. Some 18 amino acids can be found in the hair, such as proline, threonine, leucine and arginine. Keratin is particularly rich in cysteine (a type of sulfurated amino acid), which forms disulfide bonds between molecules, adding rigidity and resistance to the entire structure.

Information from: 
http://www.webmd.com/skin-problems-and-treatments/picture-of-the-hair#1
http://activilong.com/en/content/95-structure-composition-of-the-hair

Image from: https://thekinkandi.wordpress.com/tag/structure-of-hair/

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