How does hair grow? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

How does hair grow? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

How does hair grow?

Did you know that both hair and nails have the same origin? They grow from the stratum corneum of our skin. Hair develops when part of this skin enters the lower layer and takes root there. Then it makes its way up through the layers of the skin and out. There are four different layers of cells in the hair roots. They divide, multiply and push the hair shaft through the skin.

As they move, the hair cells turn into a keratinous substance, resembling the outer layer of the skin. On the outer surface of the hair, the cells become flat and stacked one on top of the other like cobblestones. Near the root cells are large, round fat cells that contain the substances needed to build hair. By the way, the hair root seems to be "screwed" into this tissue. It cannot be pulled out. So when you pull out a hair, you are not pulling out its root.

Your hair grows at a rate of about 12 millimeters per month. And the surprising thing is that they grow at different rates at different times. Hair grows very slowly at night, in the morning their growth accelerates, in the evening it slows down, and then they grow again faster. The hair on a man's head lives three to five years, while a woman's hair has a lifespan of up to seven years. And your eyelashes only live for about six months! In total, on the body of an adult, there are from 300 to 500 thousand hairs.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

How many percent of the biological species of our planet are open and classified?

The total number of biological species living on our planet is estimated by scientists at 8,7 million, and at the moment no more than 20% of this number have been openly and classified. Moreover, if the number of described terrestrial plants is 72% of the maximum, then in terrestrial animals this figure is 12%, and in fungi - 7%.

Test your knowledge! Did you know...

▪ The translation of which book into the languages of European peoples contributed to the creation of their national script and literary language?

▪ What is homeostasis?

▪ When was the day when the BBC radio station had no news?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Philips VitaLights 22.08.2014

Philips has introduced a new category of VitaLight products: Wake-up Light and EnergyUp energy boosters.

Philips Wake-up light simulates the effect of a sunrise by gradually increasing light intensity to prepare the body to naturally wake up from sleep 30 minutes before the set time.

EnergyUp devices are based on blue light, which among all light spectra is responsible for increasing energy levels. Receptors in the retina of the human eye absorb blue light and transmit a signal to the brain, regulating the biological clock and increasing activity. Blue light has an effect on the body like a clear blue sky on a sunny day, allowing you to overcome the feeling of lethargy and drowsiness.

Using the dedicated EnergyUp mobile app, you can control the device according to your individual needs and receive recommendations and tips to achieve effective results.

Other interesting news:

▪ Portable Influenza Finder

▪ quantum apocalypse

▪ USB optical replacement coming soon

▪ Passenger on x-ray

▪ striped rabbit

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the website Audiotechnics. Article selection

▪ article Microphones. Directory

▪ article Why is the pronoun I capitalized only in English? Detailed answer

▪ article Bar manager. Job description

▪ article Cologne. Simple recipes and tips

▪ article Table of conversion factors for AC signals of various forms. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews