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一个人的头发大约有10～14万根,每根头发一天内约长0.4毫米。一头漂亮的黑发,不仅能增加人的美观,而且能保持头部温度,使头部免受日晒雨淋及其它外来的伤害。随着科学的发展,人们对头发进行了大量的研究,发现它还有许多别的功能呢!不同人种的头发颜色各不一样:有的头发金黄,有的头发棕红,还有的头发乌黑如漆。这是什么原因呢?原来,头发的颜色是色素细胞中的天然有色颗粒决定的,人种不同,色素也不同,头发的颜色便不相同。同一人种中,不同人的色素含量不同,头发便深浅不一,色素越多,颜色越深。一旦头发中的色素大量减少,它就会变成银白色。
A person’s hair about 10 to 140,000, each hair length of about 0.4 millimeters a day. A beautiful black hair, not only can increase people’s beauty, but also to maintain the temperature of the head, the head from the sun and rain and other external damage. With the development of science, people have conducted a great deal of research on the hair and found that it has many other functions too. Different nationalities have different hair colors: some have golden hair, some are reddish brown, others have hair Black as paint. What is the reason? It turned out that the color of the hair pigment cells in the natural colored particles of different people, different colors, different colors, the hair is not the same color. In the same race, different people’s different pigment content, the hair will be different shades, the more the pigment, the darker the color. Once the amount of pigment in the hair is greatly reduced, it turns silver-white.