Why do people have hair, why do people have hair?

The role of hair Hair is an important part of the human body, and it is accompanied by beautiful hair since the birth of the baby, and hair is an appendage of **. Hair plays a very important role in people's lives. Cosmetic effects:

has a bright black hair, neatly repaired and generous, long and transparent, when presented in front of everyone, it gives people a kind of chic and elegant, beautiful enjoyment; On the contrary, if it is fluffy and dirty, it will give people an unpleasant feeling. Protective: Thousands of hairs wrap around the skull, naturally forming the head's first line of defense.

Thick, healthy, clean hair plays an important role in fitness by protecting the head from external mechanical and bacterial damage. 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.

Regulating: Hair regulates 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.

Because hair is the one that protects the scalp 2 to be beautiful.

Because!.. Hair can make you look good。。

Thousands of strands of hair are like thousands of strands of sorrow in life.

Summary. Hello, the reason why people have hair is: survival advantage: protect the head, block the scorching African sun, prevent the brain from overheating.

Hello, the reason why people have hair is: survival advantage: protect the head, block the scorching African sun, prevent the brain from overheating.

Human ancestors ran in the strong sunlit East African savannah, long hair fluttering hair can block most of the sun's damage to **, natural selection allows the long hair genes to be inherited and spread in the human gene pool.

Human hair is grown in order to play a role in physical protection, don't underestimate a thin layer of hair, this fiber has a very low coefficient of friction, excellent toughness, can effectively resist the unexpected impact of the natural environment of the macro slippery bridge, is definitely a miracle in evolutionary materials science.

Human long hair has the effect of heat dissipation and sun protection, people's brains are too big to make cherry blossoms, too sensitive, too fragile and too important, people with bad brains must have died in evolutionary selection, 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 be very well and very evenly adjusted the head temperature, and there will be no hot-headed or confused situation 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.

Hair that does not appear oily may be due to age, or it may be due to taking certain medications or having dry hair, so there is generally no need to worry too much. It is recommended to wash hair 2-3 times a week to promote blood circulation in the scalp area, and also help to speed up local metabolism, which is also helpful to improve the symptoms of oily hair.

1. Aging factors: Moderate amount of hair oil is usually a normal phenomenon, which is caused by the influence of androgen levels. With age, the function of various organs in the body will gradually decline, so the function of the sebaceous glands in the scalp will also decrease, which may lead to a decrease in the secretion of sebaceous glands, resulting in the hair not being oily.

2. Taking certain drugs: If you take certain drugs on a daily basis, such as tretinoin, it may inhibit the secretion of sebaceous glands, thereby affecting the secretion of sebaceous glands in the body, resulting in the phenomenon that hair does not produce oil;

3. Dry hair: If you don't pay attention to the care of the scalp in your daily life, or often straighten your hair, do perms, etc., it may lead to damage to the hair key signal, which will lead to hair breakage or dryness, and there will also be hair oil.

Coloring, curling or straightening can easily cause damage to the hair, damaging the scalp and hair, which can lead to massive hair loss. There are a few reasons why there is a lot of hair loss:

1. Malnutrition caused by dieting: hair growth needs nutrition, bullets, fish, meat, etc. must be eaten, malnutrition will affect hair growth, so that the growth of hair will be slowed down, this situation is likely to cause a large amount of scalp hair loss;

2. Mental stress: If you are in a mental state of anxiety and depression for a long time, this will make the hair absorb less nutrients, which will cause hair loss; I remember that during the period when I was taking the job title, maybe it was the irregular life and rest that made my hair volume smaller, alopecia areata, and frequent hair loss, which made me look old, and I used many methods, but it didn't work. I accidentally used a fast-growing hair serum, and after using it, hair gradually grew out on the part that didn't grow long, and now my hair is much denser than before, and my heart is filled with happiness and I look younger.

3. Bad life: staying up late will make people not get enough rest, and the vitality of scalp hair will continue to weaken, and in the long run, it is easy to fall out; Believe me in these words that may be very helpful to you.

When it comes to yellow hair, many people think of malnutrition, but malnutrition is just a too general and vague statement, to be precise, it should be the problem of yellowing hair caused by unbalanced nutrition, resulting in insufficient intake of trace elements. 1. Which trace element deficiencies can cause yellowing of hair? 1.

Copper In the process of producing melanin in hair, an important copper-containing "tyrosinase" is needed, and copper is deficient in the body...