Why doesn t human hair grow like animals?

This is a matter related to the evolution of organisms, which always evolve in a direction that is more conducive to adaptation than to adaptation. In ancient primitive societies, human beings had extremely limited ability to transform and use the natural environment, and people did not have relatively developed tools (clothing or armor, etc.) to protect themselves in terms of body maintenance, so they mainly relied on hair to protect themselves from severe cold or other physical injuries. With the gradual formation of human society, after the consciousness is slowly formed, human beings begin to understand etiquette and education, and more importantly, in terms of production and life, people begin to protect themselves and decorate themselves in the process of labor, that is, a way of survival on the choice process of seeking advantages and avoiding disadvantages, people find that the cover of clothing will bring many benefits (warmth, comfort, beauty, enemies, etc.), so that the value of the original hair is slowly reduced, and human beings are less and less directly using hair to adapt to the environment.

According to the principle of evolution, the hair grown by human beings slowly becomes smaller and shorter from the body. On the contrary, the evolutionary path of animals does not lead to the evolution of a higher social consciousness in labor and the use of tools to defend themselves. Got an idea@..

Darwin's theory of evolution says that human beings also had very long hair when they were primitive, because there were no clothes at that time, and thick hair was needed to keep out the cold. Please forgive me for not being clear.

If the hair is too long, do you ask why the hair doesn't look like a creature?

It's purified.

Categories: Medical & Health >> Common sense of the human body.

Analysis: Definition: Like sebaceous glands and sweat glands, hair is a derivative of **, derived from the epidermis of **.

Purpose: Defend and keep warm.

Lifespan: Each hair can be replaced from 50 to 150 days, and the hair can live for years.

Composition: The exposed outside is the hair shaft, and the hair root is buried inside. The swelling at the end of the hair root is called the hair bulb, and the depression at the bottom of the hair bulb is called **, which contains abundant nerve and trophic blood vessels. The root of the hair is encased in the skin by a tubular sheath sac called a hair follicle.

Causes of fox odor: In the armpits, *halo, etc., there are particularly large branched sweat glands, called apocrine glands, and the substances secreted are thicker than ordinary sweat and have a foul smell.

Hair is many, * strong.

There is data that shows that the thickness of men's hair is directly proportional to their hair. The growth of hair is mainly produced by the influence of male hormones, which act on the hair follicles and cause hair growth to flourish.

Sudden hairs can be a precursor to illness.

If a lot of white hairs suddenly grow on your face, it may be a precursor to cancer. Some people with hypertarchium may end up developing cancers such as breast cancer and lymphoma. The disease usually starts on the face and then gradually spreads throughout the body.

Be alert for sick hirsutism.

In addition to heavy hair, women with morbid hirsutism also have masculine characteristics such as muscular development and prominent Adam's apple, as well as problems such as irregular menstruation and amenorrhea. If you have any of these conditions, you should go to the hospital as soon as possible.

Each of us has hair on our body, which plays a role in perspiration, and when we feel heat, or when the body is metabolized, it will pass through the pores to remove sweat and secrete oil. But the hair doesn't grow as long as the hair on the rest of the body, usually only about one to two centimeters, so what's going on? Why do hairs grow faster?

This is due to differences in the growth period. Like the anagen phase of hair is 3 to 7 years and grows rapidly. After the anagen phase ends, it will automatically fall out and grow new hair.

The growth period of hair is only 2 months. Due to the hair follicles, the hair is both numerous and small, and the color is also light, and it changes before it has time to grow. And the hair is not always long, when the hair grows to 90 150cm, they fall out and are replaced by new hair.

It is a necessary process of metabolism.

There are many reasons why body hair grows faster, usually due to hormonal imbalances, or unreasonable hair removal methods that cause more and more body hair to grow. In addition, hand hair growth may be caused by hormones, but it may also be normal, and laser hair removal can generally be used for hair removal, and you should pay attention not to expose to the sun. If a woman's hair grows more and more, it is considered that the estrogen level in the body is disordered, or the long-term use of hormone-containing skin care products is the cause, you can check the hormone.

Long body hair is mainly due to the strong secretion of male hormones, but it can also be due to individual genetic factors. In general, it is more common in adolescent males and females with polycystic ovaries. In addition, people who take glucocorticoid medications for a long time also have longer body hair.

It is recommended to go to a regular hospital for examination to rule out pathological causes, and then treat the symptoms according to the results of the examination**. If human hair growth is purely physiological, hair removal can be selected using either laser or freezing**.

Why do animals have hair on their bodies, but people only have hair on their heads?

Hello, human beings have gradually lost their heavy hair in the process of evolution. Because less hair is better for heat dissipation, humans have more stamina than animals. Although humans do not have the speed of a cheetah or the dexterity of an antelope, their ability to travel long distances can exhaust the physical strength of their prey and capture them.

So you say you don't have stamina, you don't have sustainability? Is it lazy, or is it lazy? So why do people have hair on their heads, armpit hair under their armpits, and eyebrows on their eyes?

Hair is meant to protect the mind, protect from the scorching sun in summer, and the cold in winter, and prevent lighter collisions. Armpit hair is used to prevent friction when the upper limbs are moving. The eyebrows are to prevent rain from reaching the eyes.

So what should be protected has been protected, so what reason is there not to act?

Hair is one of the characteristics of mammals, but there are some animals that have longer and more distinctive hair than others, and some animals with very long hair are described below.

1.Bison.

The American bison is a common animal in the savannah of North America, they are large, fast-moving, and powerful, but they are also one of the animals with long hair.

The American bison has long, dense fur that grows to 60-80 cm in winter, it has fluffy shoulder hair and a mane around the neck, as well as long, powerful tail hair. This long, dense hair helps the bison maintain its body temperature during the harsh winter months.

2.Long-haired dogs.

Long-haired dogs have their elongated coat that makes them look fluffy and cute, but it also means that they need to groom their coat frequently to maintain their beauty and health.

The length and density of long-haired dog hair varies depending on the dog breed, and dog breeds such as Afghan Hounds, Chihuahuas, and Old Collies all have a certain length and density of hair. For these long-haired dogs, they need to be bathed, dried, and groomed frequently to ensure that their coat is clean and healthy.

3.Gibbon.

Gibbons are large monkeys that live in Asia and Africa, and they often live in tropical rainforests. Gibbons have long and dense fur that helps them maintain their body temperature while also acting as a protective force against physical injury.

They have a lot of body hair colors, there are orange, brown, black, etc., and the color varies depending on different dog breeds. Gibbons can have hair up to 24 cm in length, which is spectacular.

4.Sable.

Sables are small carnivores that live in Asia and Europe. Their fur is very dense and comes in two layers – a heavy bottom layer and a soft top layer, which provide them with extra protection and warmth.

Sables have silver or light brown fur and can have more than 20 fine hairs per millimeter, making them very soft and comfortable.

Conclusion. Animals with very long hair are very common in nature, and their hair not only provides protection, warmth, but also makes them stand out in appearance.