Why does the hair on the head grow and the hair on the arms stays short?

In Science Daily Online we talk once about a lunar scenario of Star Wars in Tunisia, this time we want to look, to start, in one of the characters of this famous saga: Chewbacca.If the hair of the body, of the arms for example, we would grow as much as we have in the head, would we not look more like him? Why doesn't this happen? How is it possible that the hairs of our arms are kept in the same way always ?

Wise follicles

Each hair follicle in our body corresponds to a hair.Within the follicle, cells are formed that form the new hair from the root.

Little by little, while new cells are generated they accumulate outside the foliole , they go outside, die and become what we know as hairs.

«Now I produce cells and now I don't»

Depending on where a follicle is located in our body will produce cells for a period or not .The temporary space in which if they occur is called « growth phase »and the remaining one« resting phase «.After the latter, returns to the growth phase again.

Why does the hair on the head grow and the hair on the arms stays short?

During the resting phase the hair shaft is broken and it ends up falling, so that it allows new hair to grow.We understand that the long that reaches the hair during the phase of growth will be the maximum that I can reach.

Therefore, the follicles of the arms...

The hair of our arms is programmed to stop its growth phase every 2 months , approximately, and that's why they always keep short.

Why does the hair on the head grow and the hair on the arms stays short?

However, hair is programmed to grow for years , which is why it becomes so long Lucky that they have this resting phase, but how long would it take to comb our hair?

Did you know this information?

If you liked this article, don't miss acne: myths and truths.

Comments

And you, also "procrastins"?

And you? Procrastines too? If you don't, we are sure that you know someone who does it continuously and that, surely, makes you despair.But what does this disturbing word really mean? Let's give an example: you have been dating a person for a long time, you make plans for the future, you have many illusions and projects, however, your partner never seems to decide.He is unable to formalize your relationship because something like that, not only overwhelms him, but even He is lazy. "Are we not well like that?" I often reproach you. Let's give another example: you may have the classic friend who never seems to finish his studies.It is easy to be an "eternal" university student who faces the responsibilities and anxieties of the working world. And what about people who spend all their time in front of a computer screen letting out "real life" ? Sometimes, it is much easier to let ourselves go, evading responsibilities, than to put means t...

Worms rain in Norway!

Can you imagine a rain in which instead of falling water fall bugs and animals? Well, it has happened in several parts of the globe, and in this entry of Science Daily Online we tell you, don't miss it! The soil of Norway is full of worms Many times, individuals from all over the world have witnessed rains in which in addition to having water, they were accompanied by animals of all kinds.One of the latter cases has surprised many when they have seen worms fall on the ground in Norway . One of the first people to realize this strange phenomenon was Karstein Erstad, a professor of biology, who watched as worms fell to the ground surface while he was skiing in the mountains near the town of Bergen.According to his testimony: “When I saw the worms in the snow, it seemed that they had no life, but when I took one of them, I saw that it moved and was alive ”, I comment to the local newspaper of the city, collected by Daily Mail. After giving their testimony, other pe...

5 things we only know who are nearsighted

Are you nearsighted? How many diopters do you have? If you wear glasses, you will surely have lived that decisive moment in which your visual specialist told you that you are myopic and that from then on, your life was going to be clarified thanks to some glasses.Those walking spots in the distance are over, and those blackboards that you could not read at school. If you are nearsighted, we are sure that you will identify with any of these dimensions. Would you add any more? 1.That comes from afar...Is he my father? Is he my teacher Is she my grandmother? How to deny it? If you are nearsighted since your childhood, we are sure that on more than one occasion you voluntarily forgot your glasses at home .You were in that age when you had not yet accepted them and in which you thought that taking them made you very unattractive. And you launched yourself into the world, to that world where distances are blurred, and people are little more than blurred masses with two legs (Al...

Better to study shortly or long before for an exam? You'll be surprised!

Is it better to study months before an exam or in the previous days? A study reveals the best method! Better to study shortly or long before for an exam? You will be surprised! Are you one of those who study the day before the exam even though they have always advised you otherwise? Now, science says that you might be right to do so because studying when stressed or under pressure favors learning . This is what scientists at the University of Bristol have said, discover that the hormones that are produced when stressed are causing changes in the cells, allowing memories to be stored more effectively in the hippocampus, the part of the brain related to memory. According to the Professor Hans Reul, who directs the research, stress hormones, such as cortisol and adrenaline, change genes within neurons and increase their learning capacity . This The phenomenon is called "epigenetic modification", an alteration of the genome of cells to reprogram DNA in the brain and ...

Did the Egyptians know the sperm ?!

We have dedicated many articles to Egypt, among them: "the doctors of ancient Egypt", "Hitler's bewildering love for Nefertiti", "the Book of the Dead"...Today we want to present a anecdote more than Curious: A sperm appears on an exterior relief of the Luxor Temple.After discovering it, the researchers, like you, wondered, is it really a sperm? Judging by the image, it is exactly the same as one...We discover the answer to the riddle! The sperm of the Temple of Luxor In the exterior of the Temple of Luxor There is a religious scene in which the God Amon-Min appears with a erection, ejaculating, in which a sperm is perfectly represented (as you can see in the following video). How can it be? How could the Egyptians know sperm if they are only visible with a microscope of at least 1080 magnification? The God Min is one of the oldest deities of Egypt , appears in the pre-Dynastic era; he is represented as a man with erect penis...

6 Things that only happen in North Korea

There are places in the world that seem surreal to us.One of them is North Korea, where things happen under the mandate of Kim Jong-un that seem to be taken out of a horror movie like the ones we tell you below. 28 haircuts In North Korea there are only 28 haircuts allowed, such is the dictator's control over such personal and unimportant aspects as this.Men have 14 haircuts and can have a maximum length of 4 centimeters.Single women should wear it short. Both the cultivation and consumption of marijuana is legal Curious, taking into account the strict and extensive list of restrictions imposed by the dictator in his country. Ultra-powerful leaders Citizens must believe, and if not more they pretend well, that the leaders have supernatural powers. Since childhood they are told all kinds of stories, away from the re alidad, with the aim of making them submissive and fully controllable by the system. One of the examples is that of the father of the current ruler ...

Flirt: 5 science tips

What advice would you give someone about flirting? The truth is that we are genetically predisposed to flirt.If there is no flirting, there is no sex, and if there is no sex, there is no reproduction.So, the survival of the species depends on our flirting.What are the basic keys to this natural courtship? Join us to discover them! COQUETEAR: 5 science tips 1.Eye contact This is the most important component of flirting .Looking at someone directly in the eyes shows that you are paying special attention, and also attracts the eye of the other subject. But please, don't turn it into a contest if there is someone who can stand longer without blinking, you can scare someone. 2.Body language When we talk about flirting, what we say is not very important.In fact, according to one study, what we have is only 7% in weight, as we say 38% , And our body language 55% ! According to this, people who are better at flirting demonstrate the so-called "social domain...

Dürer and his magical mathematical enigmas in art

Alberto Durero is, without a doubt, one of the most interesting and enigmatic Renaissance painters, but within his works, one of the most curious is, clearly, «Melancholy I».we see an angel with an expression between angry and sad and around him, in addition to rising up a fabulous compendium of symbols, we find the so-called magic square .Do you want to know what it is? Then read on, we are sure you would love to know this little mathematical and artistic challenge. The desolate angel of «Melancholy» Melancholy I, Alberto Dürer « Melancholy I »is one of Dürer's most famous engravings and is part of what is known as the «Master Prints», along with three more engravings: «The Knight, Death and the Devil and St.Jerome».However, the one we present in the drawing above It is, unquestionably, his most challenging work. The central character of this picture is an angel.Seeing his expression already catches our attention.Are you angry, thoughtful or, maybe, sad? For many spec...

5 Signs that you are a pathological liar

We all lie, that's right, we do it to get away with ours, not to hurt others, to get what we want.However, when those lies go from small to changing lives, you're in a dangerous situation , perhaps dangerously close to being a mitomano. There are many authors who throughout history have reflected on the lie and numerous are the phrases about the lie that today are part of our cultural background.Without a doubt it is a very interesting concept and worth exploring, but first...Are you a pathological liar? Are you a pathological liar? Find out! 1.Lies are much more frequent You should know that when you start to lie about anything, you are no longer trying to protect someone's feelings, you are a liar pathological. When you get to the point where, regardless of the situation, you get an excuse to manipulate the truth, going as far as inventing complete stories to project a better image of you...It is a clear sign that maybe you should start worrying about your te...

Science Daily Online

Search This Blog