Why don t eyebrows and eyelashes grow as long as hair?

1. The hair follicles of the scalp are different from the hair follicles of other parts of the body, because the hair follicles of the scalp can use the best protein or excess protein in the body.

2. There are three stages in the hair follicle growth cycle: the growth stage, the middle growth stage and the quiescent stage.

At any given time, about 85% of hair is in the early stages of hair growth. During this time, new cells grow in the hair follicles and the hair grows at a rate of 15 centimeters per year.

When it is in the middle phase of growth, the hair follicle shrinks to one-sixth of its original length, causing the hair roots to separate from the blood and advance towards the surface. After about two weeks, the resting phase begins, when the hair is dormant until a new cycle begins. Hair can fall out easily at this stage.

The growth cycle depends on where the hair is located on the body, and the early stages of hair growth can vary greatly, from eyelashes that are only about 30 days old to hair that is 6 years old on average. Therefore, the eyebrows and eyelashes will not grow longer after entering the resting phase.

First of all, I wanted to laugh very much when I saw this question, if the eyebrows and eyelashes are as long as the hair, then our evolution is not very thorough, because if these two things are the same length as the hair, the impact on us humans is very huge, because they will cover our glasses, and the eyes are so important to people, no matter how the science explains it, I think there is a concentrated reason why the eyelashes and eyebrows can't be as long as the hair.

1.Way. Like I said above, if the eyebrows are as long as the eyelashes, how much of a hindrance it is.

If these two things are long, it will seriously affect our eyesight, and it will also affect our judgment of one thing, we can't open our eyebrows and eyelashes every day to see things, which is very inconvenient, and will affect our whole life, in this regard, eyebrows and eyelashes can not be too long. And our ancestors must have been aware of this when they evolved, and if these two things were long, how could our ancestors still live in a complex ecological environment. For now, if you have bangs that cover your glasses, you'll also hate him as getting in the way.

2. I don't have time to take care of it often.

If these two things are the same as occasional hair, then they must grow quickly, which means that we have to get up early every day and take the time to take care of them, or we need to go to the barber shop every few days to get our eyebrows and eyelashes cut, you don't think it's a hassle.

3. Affect the appearance.

If they want their hair to be as long, wouldn't they be ugly to death, which is unacceptable to every girl, because if you want to have the same hair, then no matter how good your facial features are, there is no way to save them, because at a glance they have been covered by eyebrows and eyelashes, and there are many cosmetics that can't be used now, who likes these two things to be as long as hair.

01 The length of human hair is determined by the size and shape of the hair follicle that grows the hair, each type of hair follicle can only support a certain length of hair, and the bearing capacity of the eyebrow hair follicle is much smaller than that of the hair follicle, so when the eyebrow grows to a certain length and the hair follicle can not bear it, the eyebrow will stop growing and fall off on its own, and cannot grow to the length of the hair.

It's the same hair on the body, but the eyebrows can't grow like hair, why is that? In fact, the most fundamental reason is that the length of human hair is determined by the size and shape of the hair follicle that grows hair. The growth of hair follows a certain cycle, it can only grow to a certain age and a certain length, and then after a period of time, it falls off, and new hair grows again in the place where it falls out.

The length of hair growth is different in different parts of the human body, because different parts of hair have their own hair follicles, and the growth cycle of each hair follicle is different. At the same time, each type of hair follicle can only support a certain length of hair. The hair follicles of the eyebrows are much less able to withstand than the hair follicles, so when the eyebrows grow to a certain length and the hair follicles can't bear them, the eyebrows will stop growing and fall out on their own, and they will not be able to grow as long as a hair.

The growth period of an eyelash is 2 months, the telogen period is as long as 3-9 months, and the single dry silver eyelash has a lifespan of about 90 days, after which it will fall off naturally, and then be replaced by new eyelashes, constantly renewed.

In addition, from the perspective of function, human eyebrows have the function of blocking sweat from flowing from the forehead to the eyes, while hair has the function of protecting against cold. If the eyebrows are as long as hair, they will block the eyes and affect the vision.

Isn't it surprising that hair stays with us throughout our lives from the moment we are born, and the average person grows about 950 kilometers of hair in their lifetime. So, have you ever wondered why your eyelashes and eyebrows don't grow like the hair on your head? A picture tells you why!

Hello! Physiologically, the eyebrows are a "natural barrier" of the human body and play a role in protecting the eyes. When you go out in the rain or strenuous exercise, participate in labor and sweat, the eyebrows act as a "dam".

When it encounters wind, sand, and dust, it prevents it from flying down and hitting your eyes. But why don't eyebrows grow? This is determined by the characteristics of the eyebrow follicles.

Humans are gradually losing their hair as they evolve. Nowadays, the length of hair growth in various parts of the human body is different, with hair growing the longest and fastest, and hair growing the shortest and slower. A hair follicle is a special fluid sac located at the base of a hair that grows out of the hair follicle.

Because different hair follicles have different hair growth cycles, each hair follicle can only grow a certain length of hair. When it reaches a certain length, the hair stops growing and falls out on its own. Because of this, no eyebrows, no matter how thick they are, can't grow as long as a hair.

Because only long hair fluttering, long eyebrows fluttering have not yet appeared.

I'm going to go classmate, your question is quite interesting, ha, the eyebrows are just as long as they are, but the eyebrows, like the eyelashes, fall out periodically.

Then it would be natural to keep the regular volume.

The growth of hair is arranged in a very scientific and ingenious manner according to the physiological needs of the human body.

The eyebrows are also long, but don't you think they are scary?

Because there is a limit to the eyebrows, ah1、

It turns out that eyebrows and hair grow at different rates. Every hair in the human body can be connected.

Continue to grow for 2 to 6 years, and then the hair will fall out in a few months. If this hair grows 0 3 mm per day, it can grow to 66 cm long in 6 years. The eyebrows grow only 0 16 mm per day, and the growth cycle is only 2 months.

Left and right, once it stops growing, it doesn't take a few days to fall off. So, eyebrows are always not as long as hair.

There are about 1 million hairs on each person, which are divided into three main categories: the first category is hair, beard and other lengths.

Hair; The second type is short hairs such as eyebrows and eyelashes; There is also a type of hair. Among them are hairs.

The number is the largest. A small encyclopedia of knowledge.

A person has only a few hundred eyebrows, and its function is to protect the eyes. It can block the flow from the forehead.

The sweat and rain that come down can also block the falling dust and prevent these things from entering the eyes directly.

Eyebrows can also enrich our expressions.

This is a different type of hair that has a different life cycle, like hair has a lifespan of about 3-5 years, while eyelashes only have 5-6 months. Therefore, most of the hair is in the growth stage, only a few hair follicles are dormant, that is to say, the hair will automatically fall off when the life expectancy is reached, and the original dormant hair follicles will be activated again, if the eyelashes can also grow for 5 years, isn't it terrible, so the hair on the hands and feet is also a shorter hair, and there will be a batch of hair in dormancy, which is why hair removal surgery is usually done 4-5 times, the first time is just to remove the hair that is growing.

Eyelashes belong to decorating people's faces, and hair is precisely an organ of the human body, so hair will grow long, and eyelashes will not grow.

If your eyelashes grow longer and longer like hair, it will have a great impact on your life. You have to cut it every three or five times. The growth cycle of eyelashes is not the same as the growth cycle of hair.

Eyelashes stop growing after a certain period of time, so they don't grow longer and longer like hair.

Because the growth cycle of eyelashes is relatively short, the growth cycle of eyelashes is only two months, and they will stop growing after two months, so they are not too long.

Each cell has a certain life cycle, and the life cycle of eyelashes in the human body is much shorter than that of hair, so due to the influence of the eyelash's own growth cycle, eyelashes cannot grow as long as hair.

Because humans have genes that inhibit body hair. In addition to the hair that grows longer and longer, no other body hair will be there, which is the reason why humans have inhibitory genes.

This is that human hair has three growth cycles, the anagen phase, the fading phase and the telogen phase, and second, the eyelash is a relatively short growth cycle, so it can't grow as long as a hair.