Fast Evolution Affects Everyone, Everywhere. 1  Dec. 6, 2016 â Rapid evolution of other species happens all around us all the time -- and many of the most extreme examples are associated with human ...
Hair is simple in structure, but has important functions in social functioning. 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 raw material. Keratin is the essential component of hair. It is a protein formed by the combination of 18 amino acids, among which cysteine deserves special mention, being rich in sulphur and playing an important role in the cohesion of the hair.It is produced by the keratinocytes.hile hair contains water, lipids, traces of mineral elements and melanin, it is keratin which is its main constituent. Its organisation within the cortex is so reminiscent of a rope or a cable that it is almost worrying.