Why do different people have different hair colors?

Why do Europeans have white skin and yellow hair? Some are black and yellow hair? Why do some Africans have so much hair? So stout? So black as coal? Why do Asians have yellow skin and black hair?

Anthropologists say that modern humans originated in Africa and then moved to all parts of the world. After tens of thousands of years of evolution, why does the hair and skin of modern people have such a big contrast? All this must begin with melanocytes.

According to scientific research, the color of human hair can be roughly divided into three categories: yellow skin and black hair of yellow people, white skin and yellow hair of white people (there are also white hair and black hair), and black skin and black hair of black people. The black hair of yellow people is mostly straight and cylindrical; The hair of white people is straight, and the hair of wavy mouth color people is curly.

The reason is that with the migration and evolution of human beings in the world and the intermarriage and reproduction between different races, genes are diversified, so the hair color presents rich and colorful colors, which has become an important organ to identify different races.

The key factor determining hair color is melanocytes. There are two types of melanocytes in the human body. One is the color that covers every inch of the skin; One is hidden between the funnel of hair follicle and hair ball, responsible for the color of hair.

During the hair growth period, hair papilla cells begin to start under the stimulation of growth factors in the blood and then form hair mother cells. The hair mother cells began to divide and produced the inner hair root sheath and hair of the hair follicle. Then melanocytes began to start up. Stimulated by tyrosinase in the blood, they began to produce granular substances like a chemical factory. These granular substances were melanin granules.

Melanin granules move up with the hair medulla (commonly known as the hair pulp cavity) and then spread to both sides. Finally, they settle down in the hair cortex to form the hair color. There are two types of melanin grains, one is true melanin, the other is brown melanin. Eumelanin is dark to form black hair; Melanin is a light color that forms yellow and red hair.

The melanin conglomerates of the yellow race distributed in Asia are naturally true melanin. Under the high power electron microscope, it is clearly visible that the melanin granules present oval shape with clear green appearance, which is consistent with the beautiful oval conglomerates.

For example, the melanin production line was completely stopped, and there were no melanin particles in the hair cortex under the reflection of light, which is the whole or a piece of white hair we saw; If the operation is insufficient and the output is too small, the hair with a small amount of melanin grains in the hair cortex will be dark gray or light gray. What if melanin granules are defective products? Then the hair will be gray and yellow.

Whether it is physiological white hair or mental white hair, black hair turns white, which is a slow process. The law is that the process of changing from black to light black light black to dark gray dark gray to light gray light gray to gray gray white to light white light white to bright white. In fact, it is also the reason that the production of melanin particles in hair balls is getting less and less due to the failure of melanocyte streamline.

In this way, the process of hair turning from black to white is from the hair root in the hair follicle to the visible hair. Since there are normal and abnormal melanocyte factories in each hair ball, our hair color will not turn white at the same time, but will show black gray white color. Some white hair will appear light yellow when it recovers after the rest period The color of deep yellow This yellow is actually the natural color of protein in hair. Therefore, if you carefully observe a certain stage of human development, the color on the head will appear rich colors of black, gray, white and yellow at the same time.

Little hair is a world of color spots! Cherish life, cherish the color of every hair in life!