Why do people grow hair, what is its function, and what benefits do it bring to people

For many people, how to choose the right shampoo has always been a headache. For the many shampoo brands on the market, many people are constantly trying to choose shampoos, but few products are truly satisfying. First of all, the most important thing is to figure out the health of our hair and scalp, and figure out what function of shampoo our hair needs, and then we will choose the shampoo.

It is recommended to use Yunnan Baiyao Yangyuanqing Shampoo, the active ingredients of Yunnan Baiyao and the essence of Yunnan Baiyao Chinese medicine added to Yangyuanqing Shampoo can promote scalp microcirculation, which stems from the destruction of the scalp ecological environment, and is closely related to the health status of the whole body, and scalp health needs to be systematic, comprehensive and scientific management and maintenance.

Human hair is grown for physical protection, don't underestimate a thin layer of hair, this fiber has a very low coefficient of friction, excellent toughness, can effectively resist unexpected impacts in the natural environment, is definitely a miracle in evolutionary materials science.

People's long hair has the effect of heat dissipation and sun protection, people's brains are too big, too sensitive, too fragile and too important, people with bad brains must have died in evolutionary selection, and those who survive have brains, it definitely needs a very strict protection, first of all, the temperature is constant, the summer of the African savannah, exposure to the sun at noon, and the temperature difference of more than ten degrees at night, the hair can adjust the head temperature very well and very evenly, and there will be no hot-headed or confused because of the cold.

In addition, hair is a tactile organ, which is much more sensitive than **, and can feel the changes in the external environment at any time.

Animals are not the same as people, most mammals.

They are all covered with hair, but there are only a few places on the human body that have hair. But the hair on our head is thick and dense, no less than the hair on animals. In fact, a long time ago, the ancestors of human beings were also covered with hair.

Later, due to continuous evolution, the lifestyle and living environment changed, and the hair on the body also changed, and the hair on most parts gradually became shorter and thinner, and it became the current hair.

Only a few parts are still long hair, and the hair is long, dense, and grows the fastest. Why is only the hair left? The human mind is the central command of the body, responsible for directing the "work" of all parts of the body, so it is very important, and in order to protect this headquarters, the hair does not degenerate.

Hair has many functions. When the sun is strong, your hair will block out the sun and your head won't get too hot. When something else hits the head, the hair acts as a buffer; In winter, the hair can still be warm, as if wearing a cotton hat.

It may seem strange that the human body goes to such lengths to create such a complex substance as hair, because no one knows exactly what the actual function of hair is. Human hair is much longer than any other primate.

Regarding the role of hair, people have made various speculations and reasoning, such as protecting the head, shading light, beautifying, hair can be used as a bowstring as a rope, and so on. When it comes to explaining what hair does, none of these answers can solve the doubt that hair grows all the time. Because if it's one of these effects, the hair doesn't need to grow all the time.

In fact, the real function of hair is this: after the protein we eat enters the blood in the form of amino acids, what our body can't use, the excess, can't flow in the blood, and needs to be excreted. And our blood vessels are only open to the outside in the lungs, and in other places they are closed closed systems.

Growing hair is the main way to get rid of excess protein (amino acids) from the body. Of course, this also excretes toxic substances from the body through the hair. Therefore, a hair examination can find out whether a person is poisoned.

1. First, regulation: hair can play a role in regulating body temperature. In winter, the cold wind is cold, the blood vessels are constricted, and the hair can keep the head a certain amount of heat; In summer, the red sun is scorching, the blood vessels dilate, and the hair can radiate heat from the outside.

As a result, hair has the dual function of keeping heat both warm and cool. Hair is a fibrous tissue that grows from the scalp and is an arrangement of hard keratin formed by cell regeneration. Hair is made up of two parts: the root and the shaft.

2. Second, sensory effect: the feeling of hair is more sensitive, when the external environment has an impact on the human body, whether it is wind and rain, or sun and fire, the first thing to feel is the hair, and the information sent by it is transmitted to the brain, so as to take a variety of protective measures.

3. Third, protective: Thousands of hairs wrap around the skull, naturally forming the first line of defense of the head. Thick, healthy, clean hair plays an important role in fitness by protecting the head from external mechanical and bacterial damage.

With the increase in life and social pressures, more and more people are starting to lose their hair. Although hair loss is not painful or itchy, too much hair loss will also reduce the role of hair, which will affect our physical health.

As humans evolved, the thick body hair on the torso gradually faded, leaving only a handful of hair, what is the significance of this? The hair left behind by humans is the most bizarre in mammals, slightly redundant, and inexplicable, isn't it?

It is in primates that human body hair looks inconspicuous and is slightly fragmented, such as hair, chest hair, eyebrows, beard, armpit hair, etc. Hair still has to be taken care of, and to this day, I still worry about premature hair loss.

The essence of hair is a keratin fiber, which can be seen as the dermis that grows out of the hair follicle, which is one of the characteristics of mammals.

The hairy origin originated from the common ancestor of mammals, synaptoids, about 300 million years ago. The fur of many mammals has the effect of regulating body temperature, attracting the opposite and camouflage, and can also provide tactile extensions, such as the whiskers of felines.

It turns out that this handful of hair on the human head is an object left over from the elimination of evolution. When our ancestors left Africa, they ran under the scorching sun, foraging for food, and hunting, and their thick body hair became a burden and was not suitable for heat dissipation, so they had to fade as soon as possible.

The question is, our ancestors didn't have robes and coats or parasols in the early days, and when they ran in the scorching heat of the steppe desert, what did they use to block the scorching ultraviolet rays, and the answer was hair. This handful of hair is like a natural parasol that protects our precious skull and brain from UV burns.

Hair refers to the hair on the top of the head and the back of the head. Hair, in addition to adding beauty to a person, is mainly to protect the mind. It can protect against the scorching sun in summer and the cold in winter.

Fine, fluffy hair is elastic to withstand lighter bumps and can also help evaporate sweat from the head. The average person has about 100,000 hairs. Of all the hairs, the length of the hair is the longest, especially for women with long hair, some can grow up to 90 100 cm, or even 150 cm.

I think: it's genetically determined.

Although all cells of the same person have the same genes, not every cell controls the traits that are fully expressed.

Cells in different parts of the body express different parts of the gene, which is called "selective expression of genes".

The genes that control long hair are not exactly the same as the genes that control long eyebrows, so the traits that manifest themselves are not exactly the same.

Long hair can also reflect a person's cultural background and lifestyle. In some Asian cultures, long hair is seen as a traditional virtue, while in some Western cultures, long hair is seen as a symbol of rebellion and individuality. In addition, some religious beliefs also require their adherents to have long hair.

In many cultures, long hair is seen as a symbol of feminine beauty. Long hair not only adds to a woman's attractiveness, but also shows her confidence and independence. Over the past few decades, more and more women have chosen to have long hair instead of short hair, which also reflects the increasing status of women in society.

In conclusion, long hair is a reflection of human cultural diversity and can reflect a person's personality, cultural background, and lifestyle. Whether it is a man or a woman, having long hair can increase their charm and confidence, making them more unique and unusual.

In addition to women, men are also increasingly preferring to have long hair. Men with long hair tend to be perceived as more charismatic and individual, and able to show their freedom and uninhibitedness. In some cultures, long hair is even seen as a sign of masculinity.