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The function of human hair?
Beauty function: having a bright black hair, neatly trimmed and transparent, giving people a unique, elegant and beautiful enjoyment when presenting it to everyone; On the contrary, if it is fluffy and dirty, it will give people an unpleasant sense of party.
Protection: thousands of hairs are wrapped around the head, naturally forming the first line of defense of the head. Thick, healthy and clean hair can protect the head from external machinery and bacteria, which plays an important role in fitness.
Sensory function: Hair is sensitive. When the external environment has an impact on the human body, regardless of the wind and rain, or the sun and rain, the first thing you feel is the hair, and the information it sends is transmitted to the brain, thus taking various protective measures.
Regulation: Hair can regulate body temperature. In winter, cold wind blows, blood vessels contract, and hair can keep the head warm; In summer, the sun is scorching, blood vessels dilate, and hair can dissipate heat. Therefore, hair has dual functions of heat preservation and heat dissipation. Hair is a kind of fibrous tissue that grows on the scalp, and it is an arrangement of hard keratin formed by cell regeneration. Hair consists of two parts: root and stem.
The growth rate of hair is 1-2 cm per month, 1 year and 10-20 cm, and the growth cycle is 3-6 years, then it will fall off and grow new hair in about half a year.
Ask for an essay on "hair"! My father is ordinary, but to me, my father is the most perfect person in the world. He loves my father very much, and I like my father's hair best.
Dad's hair is dark, dense and slightly soft. It smells delicious and has the unique fragrance of shampoo.
But I like dad's hair for more than that. When I was a child, I hurt my leg because I was naughty, and I cried miserably! My father carried me all the way to the hospital. I grabbed my father's hair and cried in pain, but my father just didn't say anything. I went to the hospital with pain.
I can't walk in the hospital with a plaster cast, so my father carries me to school every day and looks at a small scalp exposed from his hair on his back. I feel distressed and guilty, but my father smiled and said that it didn't hurt at all! Smelling the smell of dad's hair feels particularly warm, and it will leave a very warm trace in my childhood memory, which I miss until now.
When I grow up, my father's hair is not as black as before. I'm really worried that my father will become bald. Once, I actually found a lot of white hair in my father's hair, and my heart was very sour, but my father smiled and comforted me and said it didn't matter. I was normal when I was old.
I just found out that my father is really much older than when I was a child, and I am growing up! So I smiled and said to my father, when I grow up and earn money, I must buy the best medicine for my father to let him grow black and dense hair again! Dad was very happy at that time, and said with a smile, my heart for my father makes him happier than growing black and dense hair! Every time I think of my father's hair, I can't help thinking of those warm memories that my father carried on his back and smelled like his hair. Maybe my father's hair will really fall out one day, but the warm love my father left me will never disappear!
Every time I see a girl dragging her long ponytail behind her head and swinging her shiny braids, I will always feel sad from time to time! My hair used to be very long, but because I spent a lot of time combing it every day, my mother threatened me and said, "If you don't cut your hair, I'm afraid my pocket money will double ...! "So I reluctantly walked into the barber shop and watched them slowly cut off my hair. My heart can't hurt any more.
After I cut it, at first glance, this hairstyle is the same as the old woman in the 1960 s, and there is no difference.
From then on, endless strange eyes followed me, which made me extremely embarrassed.
On the first day of school after my haircut, I walked into the classroom with anxiety. When I opened the door, everyone was surprised. At the same time, a strange look was cast, which even caused onlookers. I wish I didn't have this head! But to no avail. Walking to the seat, I don't adapt to the "neighbors".
Chen Xiaying sat on the seat with her schoolbag on her back and asked strangely, "Where is Zhang Xiaomei and who is in front of me?" Zhong Jiahao smiled and said, "Isn't this Zhang Xiaomei! Who else! " Chen suddenly ran over and looked me up and down, so she was surprised and asked, "Oh, my God! No! " I said, "Why not! This world is crazy. It's wrong to have long hair. Even my mother threatened me. Forget it! Stop it, the more you say it, the more sad it is! " The day after my haircut was the most unforgettable day of my life. Not bad! Now students are used to it, otherwise! I have to dig a hole to get in I miss my long hair very much and can't help thinking: hair! You are a little longer! Go back to your long hair! I'll grow my hair in a few months and I'll never cut it again!
The story of hair composition The sun shines warmly on the earth, the breeze blows, the hair is blown by the wind, and it shines golden under the sunlight.
Many years ago that night, a girl (boy) cried in the silent night, and the beautiful woman was awakened. The woman hurried to the girl and stroked her forehead.
The hot temperature surprised the woman. The woman picked up the girl and ran all the way to the hospital. On the way, the girl was lying on the woman's back, smelling the fragrance of shampoo floating from her long hair.
Confused, the girl listened to the woman's shortness of breath, and I don't know how long it took ... Later, the girl went to elementary school, and every day when she came home, she could smell the smell of food floating in the kitchen.
Girls always run to the kitchen to give women a big hug. Women always chat up girls and ask them how their day was.
Every hug, girls can always smell the food and fumes in women's hair.
Later, the girl went to junior high school.
The girl has made a group of friends and always comes home late. The woman asked the girl why she came home so late that day, and the girl yelled at her. You are really annoying.
So the woman and the girl had a big fight.
The girl dropped everything on the table.
The next day, it began to rain, and my friend didn't bring an umbrella.
The girl had to wait for the rain to stop with her friends.
A woman appeared in the rain with a blue umbrella. The girl asked, what are you doing here? The woman put the blue umbrella in the girl's hand, said, don't get wet, and rushed into the rain. The black hair was ruthlessly wet by the rain ... the girl cried.
Back home, the girl saw the woman quietly blowing her hair, and the smell of rain wafted faintly.
The girl said, let me help you.
Woman, smile.
The girl picked up the air duct and gently dried the woman's hair. Wet black hair stuck together, and dozens of pieces of silver and white were mixed together in the dark. The girl cried silently. "Your hair is white." "Yes, my mother is old.
"I'm sorry" "I'm the one who should say I'm sorry, son, you've grown up ..." Mother, irrigate me with years like water and love like sunshine, and watch me grow.
Black hair is gone, and years have dyed black into white.
The story of hair 600 words spread all the hair, referring to the hair that grows on the head.
Hair is not an organ, so it does not contain nerves and blood vessels, but cells.
Hair is mainly used to protect the head besides enhancing the aesthetic feeling.
Soft and fluffy hair is elastic, which can resist light collision and help head sweat evaporate.
The average person's hair is about 654.38+ ten thousand. Of all the hairs, the length of hair is the longest, especially for women with long hair.
Some can grow to 90~ 100cm, or even 150cm, but generally it will not exceed 200cm.
Hair color is generally determined by genes, such as black, golden yellow, brown and red.
When people get old, their hair usually turns silvery white.
Due to different races and regions, hair is black, golden, reddish brown, reddish brown, yellow, gray, and even green and red.
You can also dye your hair in various colors by dyeing it.
Scientific research has proved that the color of hair is related to the difference of metal elements contained in hair.
Black hair contains equal amounts of copper, iron and melanin. When the content of nickel increases, it will turn gray.
Blonde hair contains titanium, reddish-brown hair contains molybdenum, reddish-brown hair contains cobalt besides copper and iron, and green hair contains too much copper.
In some African countries, some children have red hair, which is caused by the serious shortage of protein.
Hair can be divided into four parts from bottom to top: hair, hair follicle, hair root and hair shaft.
The physiological characteristics and functions of hair mainly depend on the hair, hair follicles and sebaceous glands below the scalp epidermis.
Hair follicle is the part of hair root in dermis, which consists of inner hair root sheath, outer hair root sheath and hair ball. Inner hair root sheath is the sheath layer directly adjacent to hair in the later stage of hair development.
The inner hair root sheath is a hard thick-walled keratinized tube, which determines the shape of the cross section when the hair grows.
The lower part of the inner hair sheath has three layers: Huxley sheath, Henler sheath and the surface layer of the inner hair root sheath.
Before hair keratinization, the inner hair root sheath grows with hair, and its source is the cells propagated at the bottom of hair follicle.
Near the epidermis, the inner hair root sheath is separated from the epidermis and hair follicles.
Hair * * * is the lowest end of hair follicle, with capillaries and nerve endings.
At the bottom of the hair follicle, epidermal cells continue to divide and differentiate.
These epidermal cells differentiate in different ways to form different components of hair (such as cortex, epidermis and medulla), and the outermost cells form the inner hair root sheath.
At this stage, the cells are soft and non-keratinized.
The function of sebaceous glands is to secrete sebum and squeeze it out through the sebum tube. When the hair passes through the sebum tube, it will take away the sebum squeezed out of the sebum tube.
Sebum provides natural protection for hair and gives it luster and waterproof performance.
Hair muscle is a small muscle organ connected with epidermis, which depends on the external physiological environment. Hairy muscles can stretch or contract.
The drop in temperature or the action of adrenal hormones can pull the hair follicle to a higher position and make the hair stand up.
Hair cortex is the main component of hair, which is composed of slender cells parallel to the long axis of hair.
There are about 10 mm tension filaments and interfiber matrix in these cells, which determine the main physiological characteristics of hair.
Filaments are composed of fibrin, 50% of which are spiral, and the matrix is composed of cystine-rich non-spirochete proteins.
These protein are synthesized at the lower end of the hair follicle, and cysteine is converted into cystine in the final stage of synthesis.
The physical properties of hair are related to its chemical composition.
Hair will swell soon after soaking in water, and the weight after swelling will increase by about 40% compared with that before soaking in water. This phenomenon of swelling in water shows that hair is almost pure protein component with little lipid content.
Hair has a strong duality, because the arrangement of filaments in cells is parallel to the long axis of hair.
I hope it can help you solve the problem.
The story of hair composition unfolds 1 "Well, now please close your eyes and tell me how long you have been cutting your hair.
Don't be embarrassed.
"Today I want to tell the story of hair.
In the process of human evolution, perhaps the brain is too important, which makes the hair shrink into hair, keeps warm and increases a lot of sense of security.
But that's not all. There is such a profession called "monk". They don't seem to worship Darwin.
Joining this profession is not easy. Shave the hair off your head with a knife, leaving only a bare head. If you are naturally good, coupled with superb knife skills, you may even save money on the mirror-this is a joke.
Of course, you are not a monk, and I am not a monk. We don't talk about monks.
Throughout history, there are many stories about hair.
It was once regarded as a symbol of political power.
The Qing soldiers just entered the customs, and after the Manchu proclaimed himself emperor, a vigorous "braid revolution" started. Manchu asked Han people to wear long braids, but Han people had to. After all, they are "dependent". Who called them conquered people? Of course, there are also a few people who are willing to "fight against the Qing dynasty and regain their sight" but are unable to do so. They use "braiding" to express their resistance, and the outcome can be imagined.
It was also the Qing Dynasty.
As soon as the Opium War started, the "restless" Han people could not sit still and revived.
Jesus' younger brother "bent down" and reincarnated in China. He gathered a group of plowmen and hoes and changed his name to rebel in the far southwest.
The first thing they did when they rebelled was to abandon their braids and grow long hair, which the Qing army called "long hair".
When the "heavenly soldiers" came out and the Qing emperor was abolished, "foreign water" poured in.
First, some students studying abroad put oil on their hair, which is very shiny and eye-catching. Some people who don't like it call it "fake foreign devils".
After the founding of New China and the reform and opening up, "foreign water" should be called "foreign trade" instead of "foreign water".
Hair oil-the offspring of something called mousse came to China, which is also a sticky thing. Just like opium in those days, once some people get it, it seems that they can never put it down, and "Mu Si" has become an indispensable part of their lives.
Today, if you look at the people around me, nine out of ten people have divided their good hair into ten parts, or left four right six, or left three right seven, or-let it be divided, which seriously violates the natural growth law of hair.
Of course, it is not easy to achieve such an effect. After all, nature is great, but it can also be changed by human beings, so "mousse" has exerted its power. A little thing can make your hair as hard as a needle.
Poor hair! How painful! It's spring. Let your scalp bathe in spring and shave your long hair short. Maybe you'll be surprised that your image has improved.
The Story of Hair When she entered the classroom last week, she said, Teacher, can you not take off your hat? She wore a white wool hat, just the kind with a brim.
I guessed at once.
She cut off her bangs to show her forehead.
I said of course, but I asked her: I can be so tolerant here. What should I do when I get to school? She didn't answer.
After a while, she said that the teacher cut it for me, but I wouldn't let her, so the teacher cut it for me.
The teacher said he would check.
Her eyes are red.
I'm surprised to say that you didn't perm it either, so it doesn't violate the school rules.
With tears in her eyes, she murmured, The teacher says my hair is too long.
I've been crying.
Crying all the time
Her bangs are really long and almost block her eyes.
Tie the back in a ponytail.
I know why she wears her hair like this.
She is an unconfident girl, not beautiful enough, not lively, and her academic performance is below average, and some subjects even fail.
Born in an ordinary family, wearing ordinary clothes.
Thin, shy, silent.
She thought she had nothing to take, so she wanted to hide, hide, cover her forehead with her hair and even cover her eyes.
Her teacher may be impatient with her silence and retreat and cut off her bangs.
She 13 years old, a junior high school student, a girl. Since 13 years old, it is her greatest shame to be treated like this in the classroom.
I put down my composition and told the story of my hair.
I said, when I was a child, I was forced to cut my hair by adults.
At that time, I was seven years old and just entered primary school. My father had a whim to give me a haircut, and my mother immediately agreed, so I don't have to comb my hair.
They put me on a stool, and whether I agreed or not, like it or not, I began to cut my hair.
They are unprofessional, their hair is getting shorter and shorter, and finally they have to cut it into a boy's hairstyle.
At that time, this hairstyle was not popular at all, and it was strange for girls to have short hair like that.
I cried all night, hoping it was a dream.
The next day I got up early and wore a sky-blue headscarf. I sat in my seat, afraid to take it off.
The Chinese teacher said first, you are so early.
Then he asked strangely, why don't you take off your headscarf? I whispered, I turned my head
The teacher said, really? See the teacher.
I slowly took off my headscarf, and the teacher said with a smile, it looks good.
I got a little comfort, but I was silent for several days. I didn't want to call my father that day.
But now I forgive them.
Everyone will be hurt in the process of growing up, and teachers will also be hurt a lot in their growth.
You see, I am very happy now.
My dad is still hitting me.
A boy said.
I smiled, you are in the second grade, and your father is still doing it.
He said he was my father.
Then he turned his head, faced the wall and blinked a few times.
In a word, I think it's your teacher's fault.
I looked the girl in the eye and said.
Her eyes are red again.
No matter who I face, I insist that it is wrong for teachers to cut their hair without the permission of students, especially female students.
Hair is like a girl's special dress, which plays the role of protection and recognition. It takes a lot of courage to change the hairstyle, and even parents have no right to force their children to have any hairstyle.
Besides, there is nothing wrong with the child's hairstyle.
I know that no matter who it is, it will be a little uncomfortable to see a hairstyle whose eyes are almost covered by hair, but that's the problem.
I finally turned this confident girl into a smile on my face, and now my colleagues are going to ruin my job.
She has hardly been to New Mart. ...
The composition of boys pulling girls' hair Some students' parents always prefer boys to girls and think that their sons can carry on the family line. This is a very wrong idea in the 2 1 century, then we will leisurely think of a question: Is it better for boys or girls? Everyone must want to know the answer, so let's study it together! Boys VS girls in the first round: Boys can only dress in clothes and pants, while girls can not only wear clothes, pants, but also skirts; Boys' clothes are generally dark, such as black, white and gray.
And girls' clothes are colorful.
Girls can keep three thousands of feet's beautiful long hair (exaggerated! ), boys can't keep their hair more than a foot, and girls can decorate their hair with some small hairpins and the like.
Everyone commented on boys: monotonous! Everyone's evaluation of girls: colorful! The first round: the score of girls' victory: 0: 1. The second round: teachers like indexes. Boys are naughty, and some even contradict the teacher. Teachers are annoying, girls are more obedient and careful, and teachers like them very much. Therefore, teachers prefer girls.
Teacher's evaluation of boys: it's too noisy, I'll invite your parents again! Teacher's evaluation of girls: girls are really good, which makes teachers feel at ease! The second round: girls win the score: 0:2 (boys: whoops ~ ~ Don't invite my parents! ! ! ) the third round: parents like the index boys to be noisy, some parents are annoyed, and girls are very good, which is their mother's intimate little cotton-padded jacket. However, some parents and elders look at it from an old perspective, thinking that sons can carry on the family line, and married daughters are splashing water, but some parents are more "modern" and think that their daughters are smart and lovely and like their daughters. It's not clear yet! Parents' comments on boys and girls: Both daughters and sons are our children, and we all love them! Boys and girls: Mom and Dad, I love you, too! Round 3: Tie score: 1:3 Round 4: Practical index What can boys do but girls can't do? It seems that anyone can! Martial arts, which boys prefer, are also learned by many girls, and they have achieved good results.
Anyway, as long as you work hard, you will be rewarded.
Girls and boys are equal! Everyone's evaluation of boys and girls: study hard quickly, only in this way can you gain something! ! ! Students: Teachers and parents, you can rest assured that we will study hard and will not live up to your expectations! ) the fourth round: the score was 2:4. After four rounds of competition, the result came out. The score is 2:4, and the girls win! Experiments show that girls are no worse than boys! Although there are fewer parents who prefer sons to daughters now, there are still many parents who have this idea. It's 2 1 century, so don't look at us with old eyes.
Through experiments, we confirm that girls are no worse than boys. As long as they work hard, they will always succeed! Let's work together!
I remember the anguish when scratching my head and thinking about materials, the carefree comfort when trying to write, and the blushing heartbeat when being praised by the teacher. All this flashed before my eyes like a dream.
I used to hate writing compositions, revising them over and over again, being afraid of having nothing to say and write, and all this.
Whenever there is a composition class, the teacher tells us to observe carefully, be careful and decent, and make sentences fluent. These are always the original words. The weekly composition class is regarded as a self-study class by me, and all kinds of homework are completed in my composition class. When I get home, I will dig up mine, find similar composition topics and copy those so-called beautiful words. This is my composition! Once I wanted to write something unique and creative, but the teacher's sentence: "The structure is scattered and the sentence is unreasonable" completely ruined my original passion for literature.
I really want to say, what should I take to save you, my composition!
Dad's hair has two colors, black and white. The hard white hair of glistening is carried by several people, my growth is carried by several people, my family is carried by several people, and some people have troubles in life.
In the past, I only thought it was about my father's age.
But in retrospect, every gray hair of my father records his selfless love for me and his hard work over the years.
When I was in hospital, I saw it, and I saw my father's careful care for me.
When I first arrived at the hospital, I was not used to everything there.
My father takes me to a hospital not far from home early every day, and then rushes to work. At that time, he always tried to pick me up from work early and left all his troubles to me.
At that time, I lived a comfortable life all day, but I forgot what my father had done for me.
Dad's white hair echoed in my mind one by one, and the feeling was so profound.
At first glance, dad couldn't be more ordinary. Although he is not tall or strong, he has no power or influence.
But he has been trying to protect this family and work hard.
My father is very busy, and there are only two rare holidays for the whole month. My father is a knitting designer, and he still takes some orders for our better life.
Work at least half a day during the holiday.
He can barely rest for a day.
But he still spends his precious time on me.
Let me have more time to see his white hair.
Dad is always so concerned about me.
"As long as you take care of yourself and study hard, you will be fine.
This sentence is so familiar. This is my father's most ardent wish on Father's Day every year. My father always cares about my tomorrow and hopes that I will have a good life in the future.
Always worried about my grades and health.
And I often miss this kind of casual dribs and drabs.
I don't know why, but now I think of my father's love for me, and a deep sense of shame arises spontaneously.
Then I looked at my father's face again. I saw the burden of his work and the hard work of bringing home the bacon. Looking back now, it was not just a white hair, but his hard work for me! It is in my heart that I will always have these unforgettable white hairs.
Please indicate the source? The function of human hair?
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