人的毛发（Human hair）

人的毛发（Human hair） 人的毛发(Human hair) The hair is green, red, yellow, white, brown...... A variety of colors, why? A man is not made for 50 consecutive years Haircut, how long is it? How long eyelashes life? The eyebrows, nose hair have what use? Hair The hair in the world, due to ethnic and regional differences, there are black, yellow, red brown, red brown, yellow, gray, and even green and red. Scientific research shows that metal elements contained in the color of the hair with the hair in the different. Hair contains the same amount of copper, iron and melanin, when the nickel content increases, becomes gray. Golden hair contains titanium, molybdenum containing red brown hair, red brown in addition to copper, iron, and cobalt, green hair is contained too much copper. In some African countries, some children's hair was red, is the result of a serious lack of protein. The general people's hair about 100 thousand or so. Under normal circumstances, the hair growth of about 0.3 mm per day, 3 days for 1 mm. Sunlight can accelerate hair growth. Each hair life is generally 2 to 4 years, the longest up to 6 years. If 50 consecutive years if not hair, can grow to 6 meters. It is said that India has a monk Dean Shi Huamei, his hair was long and 7.9 meters, is the world's longest hair. Hair in addition to increase the beauty of people, mainly to protect the mind. Can prevent in the summer sun, winter cold. Soft fluffy hair has elasticity, can withstand the lighter collision; also help head sweat evaporation. Such as hair loss, is a kind of morbid, but mostly in the case of systemic diseases, such as acute infectious diseases such as typhoid fever, scarlet fever, caught, or suffering from chronic diseases such as tuberculosis, anemia, diabetes and endocrine disorders, and the occurrence of local skin pathologies, such as alopecia, seborrheic dermatitis and so on, can cause hair loss. Eyebrows - eyed "guards" Eyebrows, many see a It differs from man to man., eyebrows, eyebrow, frown, triangular meniscus brow, eyebrow line etc.. There are thousands of bushy root, sparse had hundreds of. It is the root of grease spreading, forming a natural barrier. Physiologically, the eyebrows are called eyes "bodyguard". When Sweat streamed down the face., the sweat stopped, not into the eyes; in the dust, the dust above the eyebrows fall off the block. The eyebrows are the first line of defense to protect the eyes. To the elderly, can become white eyebrows, thinning, but generally not off the eyebrow phenomenon. If you have leprosy, hypothyroidism or suffering from severe alopecia areata". The eyebrows will fall. Beautiful lashes Eyelashes, eyes are the second line of defense. Anything close to the eyes, first of all to meet the eyelashes, and instantly closed caused by reflection, to protect the eye against external aggression. Eyelashes can prevent ultraviolet damage to the eyes. In the life of the eyelash hair short, only about half of the time. Suffering from trachoma, can cause "trichiasis", the inverted lashes thorn to the eyeball, damage the cornea, which requires surgery to correct. The respiratory tract "sentinel" - nose The nose nose like sentinels, can stick to any tiny dust into the nasal cavity, so they can not invade. Large foreign bodies, such as insects, grass into the nasal cavity, nose hair will not only block, but also to the nerve conduction, causing sneezing, clear them out. So, pull nose hair, cut hair, nose is harmful. Male symbol - beard The beard is a symbol of male specific, controlled by testicular androgens. Before puberty, the beard is not long because testicular development is not mature. After puberty, beard, pubic hair, armpit hair will gradually grow. If you lose the testis, like the ancient eunuch, did not have a beard. The beard in physiology almost no what function. Armpit hair and pubic hair Both men and women have armpit hair and pubic hair. These two kinds of hair, not only control function the same, and are affected by adrenal androgens. The armpit and pubic often by friction, and axillary and pubic hair can reduce local friction, and can help the sweat out. Hair and hair much less Some people, body hair is very scarce, medicine known as "idiopathic hypotrichosis". There are congenital atrichia, such as Yang Tianzhao, Yunnan Yang Yiliang County Tianshun two brothers, no hair on the head, face no eyebrows, eyelashes, nose hair, beard, hair or, skin smooth, and its two sister hair and the hair is all black, there is no other family is hairless phenomenon. If you suffer from adrenocortical insufficiency disease, may appear thin hair and hair loss symptoms. On the contrary, some people, especially women, hair thick and thick, even small beard, pubic hair. The phenomena, which is called "idiopathic hirsutism" disease, and genetic factors. In addition, if women suffering from adrenal tumors, androgen increased, there will be the phenomenon of hairy men. There are also individual female hairy phenomenon. Such as Zhejiang Changxing County 20 year old girl surnamed Li, viviparous hairy, hairy on back, waist, abdomen, legs, small arms. Has aroused the attention of scientists and medical research.