How can human hair be gray??? Why is human hair gray?

Whiteheads in old age are caused by natural functional decline and sexual physiological changes; Juvenile whiteheads are due to genetics or hair disease. Usually people with gray hair are mostly associated with severe malnutrition, pessimism, depression, and emotional agitation.

The principle of biology is that the number of enzymes in the pigment cells of your hair roots decreases, the activity decreases, and the melanin produced decreases. The gray hair of the elderly belongs to this category, the natural aging of cells.

There are two causes of gray hair: congenital and acquired.

There are several reasons for the day after tomorrow: nutritional deficiencies, chronic mental stress and lack of sunlight. Weakened kidney function.

In addition, some ** diseases such as vitiligo can also cause gray hair. Normal people generally start to grow gray hair at the age of 35, and if it appears early, it is best to go **. It is difficult to treat gray hair caused by congenital heredity, but the gray hair produced by acquired causes can be improved after **.

People's hair is gray because they are angry, so can't there be a saying that they will turn white overnight?

A hair is like a tube that is filled with cells and pigments. There are spaces between these cells and the pigments, and the voids are all fluid. When a person gets older, the hair grows more and more slowly, and the liquid in the hair is produced less, and gradually, there is no longer liquid in the middle of the hair, it is all filled with air, and the hair no longer produces pigment, and the human hair becomes gray.

Tyrosinase decreases, resulting in a decrease in melanin secretion, which then leads to gray hair.

If you lack melanin and a variety of trace elements, you will become black if you can supplement gray hair.

Mainly due to the fact that most of the cells in the body are in a state of aging, the reduced activity of some enzymes leads to a decrease in the synthesis of a protein, and human hair is so white.

Gray hair is not uncommon. Not only the gray-haired elderly, but even the energetic teenagers, you can sometimes see the presence of gray hair. The spectacle of a white head in one night will not appear, and the speed at which the hair turns gray can only be equal to the speed at which it grows.

Stress does cause hair to turn gray, but the underlying cause is the genes.

Hair is lifeless, it is mainly made up of keratin and cannot convey any nutrients or messages. The "root" of the hair, located in the hair follicle. The hair follicle is like a "hair processing factory", and the reason why hair keeps getting longer is because the hair follicle is constantly adding new keratin to the hair roots.

Hair follicle cells cause melanocytes to synthesize melanin, which "colores" keratin and hair. As we age, melanocytes stop producing melanin, and hair becomes gray. As for when the hair starts to turn gray, it all depends on the genes.

However, external factors, such as stress such as crushing pressure, malnutrition, smoking, etc., may also damage melanocytes, reducing melanin production and affecting hair color. It takes decades for most people's hair to go from black to white because there are no less than 100,000 hair follicles on the scalp. But it is also possible for hair to turn completely gray in just a few months, but the cause of this phenomenon is not stress or sadness, but also an aging process.

Sometimes, some people have all their hair follicles at the same time to create gray hair, so as soon as they get a haircut, the black part is cut off, and only a full head of gray hair remains.

The gray hair on the young man's head is probably due to the fact that some of the hair follicles on their scalp are not working properly, so some of the hair does not "color" and grows out, so we see a black and white hair.

It's the blood heat that causes the hair to turn white.

Insufficient melanin secretion in the hair of a person after aging leads to gray hair.