|
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese|
BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Why do people get old? Detailed answer
Directory / Big encyclopedia. Questions for quiz and self-education Did you know? Why do people get old? Do you know that in ancient Rome, the average life expectancy for people was only 23 years? Even 100 years ago in the USA it was 40 years. Most people prefer to live long and no one wants to grow old. But aging is a process that begins at birth and continues throughout life. We know what happens to people as they get older and older. All functions and reactions of the body slow down. For some, a breakdown occurs, sensations become dull. Usually there is a loss in weight and height. Aging is also accompanied by visual impairment, partial deafness; hair turns gray, skin becomes flabby, bones lose their elasticity. Not all people age the same way, but certain changes that come with age cannot be avoided by anyone. These are changes in body tissues and in all organs. For example, tissue cells of the kidneys, liver, pancreas and spleen begin to deteriorate. This happens because blood vessels begin to age, become less flexible, and tissue nutrition deteriorates. Similarly, the functioning of the thyroid and other glands deteriorates. The entire circulatory system of the body begins to change with age and function less actively. These changes make life more difficult. Eyes, ears, bones and joints, blood, skin, hair, nails and teeth all begin to degenerate. In the process of aging, the amount of gastric juice in the gastric tract decreases. The tone of the muscles of the stomach and intestines is lost, blood circulation is disturbed. That is why older people are recommended a special diet. Such changes are biological in nature and cannot be prevented. It's just that old tissues and organs can't do their job. But there is no uniformity here. A person in his sixties may have some of the tissues and organs of an octogenarian. And the rest of the organs can be in such good condition as a person of forty, thirty or even twenty years old. Author: Likum A.
What is erosion? Erosion is the process by which the surface of the earth is slowly erased. Rain falls on soft soil and carries thick streams of mud into rivers and streams. The wind that collects the earth from the fields drives sand and dust. Whirling streams along the banks of rivers and lakes, waves hitting the shore wash out the clay shores. They gnaw sand and stones from rocky cliffs, turning rocks into sand and grinding it into even smaller pieces. Then all this is taken out by water into the sea. This is erosion. To her we owe the appearance of some of the wonders of the world, such as the Grand Canyon in Arizona. But erosion also has a negative side. In the late 30s, it turned the fertile plains of Kansas, Oklahoma, and Texas to dust, leaving thousands homeless. Water is the main culprit of erosion in the world. It seeps into cracks in solid rocks and, as it freezes, tears the rocks to pieces. After many years of such exposure, the rock turns into soil, and then the soil is washed away. Rain soaks into the soil until it is sufficiently wet. The remaining water flows over the surface, first in the form of streams, and then collected in rivers. It always carries the soil with it in the form of dirt. Streams slowly, over many millennia, break through the valleys through which they flow. The valleys widen and meet. The forces of erosion erase the earth sometimes to sea level. Wind also helps erosion, but it acts much more slowly than water. In ancient times, glaciers also contributed to erosion, which erased the edges of the valleys. America's agriculture has been hit hard by erosion. Farmers didn't realize that precious topsoil was being carried away, or didn't know how to stop it. They plowed the earth deeply, and the subsoil layer came to the surface, which quickly turned into dust and was blown away by the wind. Today, new agricultural practices are helping to prevent losses from erosion. On the one hand, farmers no longer use the plow on such a scale. They leave wheat and corn stalks in the soil, which helps hold the ground. In rough terrain, they work the areas along the slopes, instead of plowing them from top to bottom. This is called contour plowing and leaves no furrows for water to run off the slope. Today, farmers have mastered many ways to save precious land and keep it from being carried away by water and wind.
▪ Do elephants remember everything? ▪ Where is the fast food restaurant that advertises itself as the most unhealthy in the world? ▪ How is the Terminator different from the Herminator?
Machine for thinning flowers in gardens
02.05.2024 Advanced Infrared Microscope
02.05.2024 Air trap for insects
01.05.2024
▪ 802.11ac Ecosystem Announced ▪ Promising material for lithium-ion batteries
▪ section of the site Cultivated and wild plants. Article selection ▪ article Converting 35AC1 into a subwoofer. The art of audio ▪ article What is silicon? Detailed answer ▪ Seiba's article. Legends, cultivation, methods of application ▪ Stroboscope article. physical experiment
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua |
Random interesting fact from the Great Encyclopedia:
See other articles Section 
Latest news of science and technology, new electronics:
All languages of this page