Human hair into long-haired, short-haired, vellus hair and so on. Range of hair belonging hairy, long-haired often 1 cm or more, and more stiff, dense color.
The number of hair about 10 to 150,000, the scalp area of ??about 600 square centimeters, about 200 per 1 square centimeter hair.
The shape of the hair straight hair, wavy hair and curling hair. The majority of our nation for straight hair, straight hair without volume, circular cross section. Mostly white wavy hair, oval in cross-section. Black man curled hair, a large cross section variation.
Hair color black, brown, yellow, red, white and other colors. Melanin-containing mostly black, little gray, compared with non-white, iron pigment was red.
Diameter of about 0,08 mm haired, European and American people about 0,05 mm. Ultra-fine hair diameter of about 0,04 - 0,06 mm, and there is a hot hairstyle is not easy to maintain, under the microscope: Hair epidermis careless. Extra Coarse hair diameter of about 0,09 - 0,1 mm, and there is not easy to comb along to take care of, but the hair is easy to maintain, under the microscope: Hair skin tight.
The moisture content of the hair Human Hair Wigs is about 11% to 16%. Susceptible to the influence of temperature, moisture content of hair damage by the large change.
The main component of hair keratin, by a variety of amino acids, of which the highest content of cystine. Which also contains melanin and iron, it can affect the color of the hair.
Hair growth cycle is divided into three stages, namely the growing season, and shedding telogen phase. Hair growth is about 3 to 7 years, and even up to 25 years who telogen about 3 to 4 months. Hair growth is inconsistent, and subject to the season, age and other factors. Hair growth rate of about 0.27 to 0.4 mm per day, the average growth is 1 cm per month, per year growth 15 cm. Hair growth by the nervous and endocrine systems of control and regulation, particularly affected endocrine obvious. The average hair shedding 50 to 100 a day, accounting for about 0.1% of the total hair.
Nutrition and hair have a close relationship. Low-fat or fat-free foods can cause hair loss, hair color fades. Vitamin A deficiency can make hair thinning, vitamin B can make hair shiny. Copper deficiency can produce gray hair, iron hair becomes brown. Hair has a certain degree of flexibility, which is a basis for the hair can be arbitrarily curved. Good elasticity hair, ripple can be kept hot too long after some easy relaxation; rather poor performance of elastic hair is loose and easy to tangle.
