Hair knowledge
Hair is in the position of head and Hou Naoshao hair.
Apart from the increase in people hair beauty, mainly to protect their minds. Summer can prevent the scorching sun and cold winter could be Royal. Xiruan fluffy hair flexibility, and resistance to a lesser impact; can also help head sweat evaporation.
Most people's hair around about 100,000.
In all hair, the length of the longest hair, especially women who stay long hair, and some can grow to 90 ~ 100 cm, and even up to 200 cm.
Under normal circumstances, the hair growth of about 0.3 millimeters per day, 3 day long about one millimeter. Sunlight can accelerate the growth of hair. The life of each hair is generally 2-4 years, the longest up to six years. If not for 50 haircut, it can to six meters long over. It is said that India have a history of monks Institute, China and the United States, his hair was long and 7.9 meters, is the world's longest hair of the people.
Hair in the world, due to the different ethnic and regional, black, gold, Honghe, red brown, light yellow, grey, green and even red. Can also be dyed hair dyed a variety of hair colors. Scientific research has proven: hair color, with the hair metal elements contained in the different relevant. Brunet containing the equivalent of copper, iron and melanoma, when the nickel content increased, it will become off-white. Golden hair containing titanium, reddish-brown hair contains molybdenum, in addition to the red-brown copper, iron, but also cobalt, green hair is contained too much copper. In some African countries, some children's hair red, is caused by a serious lack of protein.
The yellow and black people's hair for the vast majority of black and white people have a variety of colors. The reason why there will be a different hair color, with black hair is because of the number of different distribution caused by, and a large number of particles, density, while black hair, hair color, On the contrary, in the sunlight will show different The color.
Hair and skin is not a vertical growth, the general inclination angle to 40 ° 50 ', and different parts of the hair also tilt the direction of inconsistency, that is, people formed the word "first Xuan."
If a lot of hair loss, is a morbid, but most cases took place in a systemic disease of the circumstances, as had acute infectious diseases, like typhoid fever, scarlet fever, or suffering from slow such as tuberculosis, anemia, diabetes and endocrine disorders, as well as local A skin disease, such as alopecia areata, seborrheic dermatitis, can cause hair loss.
