Principles of hair physiology

There are more than 2000 kinds of proteins in the human body (DNA), human protein accounted for 65%, water 18%, fat 17%.
A form of hair: hardened by the accumulation of proteins arrayed
Second, the formation of the hair follicle: determine the shape of the hair, can be changed by the perm, the hair itself is not viable, leaving the scalp can not survive.
Third, the role of hair: in ancient times was used to shelter, in a contemporary styling, beautiful 2, 3 warm and protect the scalp.
Fourth, hair growth time :2-6 years, the monthly growth of about 1-2CM, when the length of time in the 20-30CM, slow growth, growth rate and seasonal, weather-related.

Fifth, the growth of hair in three stages: 1, germinal stage; 2, growing; 3, telogen.
Six, the three layers of the hair, the four keys: A: three layers: an epidermis: fine scaly arrayed transparent body, about 27-28 layers. 2, cuticle: arrangement made by the helical filaments containing melanin particles, protein amino acids and other substances. 3, medullary layer: Arrange the sponge-like body made of vacuum, valuables hair does not exist. B: Four Key: hydrogen; salt bond; disulfide bond; amino bond;
(Hydrogen bonds, salt Key: Disconnect the water will encounter hot regrouped under the influence of water and temperature, can be cut off after the reorganization hydrogen bond with poly thermal effect, ceramic hot hydrogen bonds can be opened, dry restore memory. , hair is maintained (ceramic hot when heated to high temperatures in the memory 135.) disulfide bond: the strongest bond in a chain, a bond when perm control chain amino bond reorganization after cutting: hair valuables there is no supply nutrients to the hair.)
Physical hair: a resilient; having two strong elastic, stretchable; stretch water, dry shrinkage 3, plasticity; can deform the hair by hair tools. Chemical hair: 1, water absorption: damaged hair absorbent very strong. 2, drainage: to resist hair obvious;