What is skin? Detailed answer

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

What is skin? Detailed answer

Big encyclopedia for children and adults

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

Did you know?

What is skin?

When we think about the human body, we tend to refer to the heart, liver, or brain as "organs." They have certain functions, and they perform them. Did you know that the skin is also an organ of the body?

While other organs take up relatively little space, the skin spreads over the entire body in the thinnest shell of 20 square meters. see. The number of complex structures present in every centimeter, from the sweat glands to the nerves, is truly fantastic.

The skin is made up of two layers of tissue. One of them is a thicker and deeper layer, the so-called "corium", and on it is a thin tissue - the "epidermis". They connect together in an amazing way. The lower layer has outgrowths in the form of "papillae" that penetrate the upper layer, thus linking them into a single whole.

Since these "papillae" are located in the folds, each area of the skin creates its own pattern. Our fingerprints are actually formed by these folds.

The top layer of the skin, the epidermis, does not contain blood vessels. It consists of cells that have already died and "keratinized". We can say that the human body is covered with a horny "shell". This is very beneficial as the stratum corneum helps to protect us. It is insensitive, so it protects us from pain. Water does not affect him, and he is even a good insulator.

However, the lowest layers of the epidermis are very sensitive. Their job is to create new cells that are produced from the mother cells and, as it were, are pushed up by them. Over time, they stop receiving food and die off, turning into a stratum corneum.

Every day, billions of upper keratinized cells fall off in the course of our life. But, fortunately, the same number of new cells are produced daily. Therefore, our skin always remains young.

The skin has 30 layers of keratinized cells. As soon as the top layer of skin is washed off or erased, a new one is ready under it. We will never be able to use all these layers, as there is always a new one coming up from below. Thus, we have the ability to clean the skin from stains and dirt and keep it clean.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Where did rats come from?

Nobody likes to talk about rats because they are very unpleasant creatures. But they have a significant impact on human life. Brown rats carry fleas that can spread a terrible disease - the bubonic plague, or the Black Death. More people died from this disease than during all the wars in the history of mankind combined!

The brown rat, which is a common domestic rat, is native to Asia. It appeared in Europe around the time of the Crusades. Partly these creatures got on the ground, partly - on the ships on which the crusaders returned to their homeland. Within a short period of time, the rats spread throughout Europe. They made their way to the United States during the American Revolution and then gradually spread throughout the country, following the pioneers moving further west.

Why is it so difficult for a person to fight these creatures? The reason is that rats have an amazingly strong ability to adapt. The more prosperous a person's life is, the better life is for rats, because the more food around, the more they get. On the other hand, as the history of the last centuries testifies, when bad times came for a person, rats began to "take care" of themselves: they became cannibals and devoured each other.

An ordinary rat is an extremely cunning creature. It cannot be done on the same trick twice. Food mixed with poison may kill a few rats at first, but other rats will quickly learn to avoid it. An ordinary domestic rat usually weighs about a quarter of a kilogram. Its color can be from pure gray to reddish and black-brown. In length, it reaches about forty - fifty centimeters.

If rats of any other species appear in the area, brown rats drive them away and keep the territory for themselves. They can be found wherever a person lives, except for the Far North and areas with a very dry climate. By the way, not every cat is able to catch and bite a rat.

Test your knowledge! Did you know...

▪ When was soap first made?

▪ Why does hair turn gray with age?

▪ What drink did the Germans invent, having lost the supply of ingredients for Coca-Cola?

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

Panasonic 10x cameras 24.04.2006

A series of three innovative models of Panasonic Lumix digital cameras was recently introduced, including DMC-TZ1, DMC-FX01, DMC-LS2.

Equipped with a LEICA DC VARIO-ELMARIT lens, the 1-megapixel DMC-TZ10 is the smallest digital camera with 112x optical zoom (58x1, 40x2, 2mm). It comes with a 5-inch LCD display and a next-generation Venus Engine III image processing chip that delivers a 20x reduction in noise and a XNUMX% reduction in power consumption while improving performance.

Extra Optical Zoom (EX) brings optical zoom up to 12,5x at 3-megapixel resolution, while High Sensitivity mode automatically sets the maximum light sensitivity (ISO 1600) to reduce blur when shooting moving subjects.

The 01-megapixel DMC-FX3 is equipped with a 6x wide-angle zoom lens (EX function increases it to 5x), while the 2-megapixel DMC-LS3 has a 3,8x optical zoom (XNUMXx with EX)

Other interesting news:

▪ Bear self-treatment

▪ A new type of tectonic activity has been discovered on Venus

▪ TI REF1933 - Dual output voltage reference

▪ IR network instead of Wi-Fi

▪ A quantum crystal has been created

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Low frequency amplifiers. Article selection

▪ article Carrying sheet materials. Tips for the home master

▪ article Why did Batu Khan interrupt his campaign in Central Europe? Detailed answer

▪ article The functional composition of Recor TVs. Directory

▪ article Single-stage AF amplifier. Encyclopedia of radio electronics and electrical engineering

▪ article Stabilizer overload indicator. 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