What is homeostasis? Detailed answer

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What is homeostasis? Detailed answer

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What is homeostasis?

This is the ability of an organism, including, of course, the human body, to maintain constant conditions of the internal environment (temperature, acidity, etc.).

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Do porcupines shoot with their quills?

Porcupines have always been considered irritable, stubborn animals. Even Shakespeare described them as such. In Hamlet there is this line: "Like quills on a frenzied porcupine."

In reality, the porcupine is a completely harmless creature that just wants to be left alone. In winter, it curls up in some kind of hole or recess and sleeps most of the time. In summer, he leisurely wanders through the thickets, looking for bark, branches, roots and leaves from trees and bushes.

Porcupines are found in Europe, Africa, India and South America, as well as in the United States and Canada. American varieties of porcupines reach 1 meter in length and weigh 713 kilograms. Its needles are about 18 centimeters long. They are yellowish white with black tips. The quills grow among the fur of porcupines and consist of a rod with a hard end.

When a porcupine is born, its quills are soft and silky. It only takes a few weeks for them to harden. If a porcupine is attacked, it bristles its quills and curls up into a prickly ball. These spines are rather loosely attached to the body of the porcupine. Because it often swings its tail in front of the snout of the pursuer, the needles come off quite easily.

That is why people believe that the porcupine "shoots" with its quills. He doesn't. They just fly off. Porcupines usually sleep during the day, and at night they come out in search of food. They use their long, sharp claws to climb trees, and then perch on branches and gnaw on bark and branches. The porcupine stuffs bark, twigs, and leaves into its mouth at the same time. Since porcupines are very fond of bark, they cause great harm to the forest.

It is known that only one porcupine during the winter can destroy 100 trees! Porcupines are also very fond of salt. They impudently enter human habitats and gnaw on any objects touched by salt or even sweaty human hands!

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A post-carbon transition study by the Oxford Martin Program shows that a decisive transition to nearly 100% clean energy by 2050 will result in $12 trillion in energy cost savings. Other benefits of this move include providing more energy to the global economy and increasing access to energy for people around the world.

The results are based solely on the cost of various energy technologies and do not take into account the costs associated with climate damage and adaptation to climate that could be avoided by switching to clean energy.

The research team used major energy models to analyze thousands of transition cost scenarios and found that over 20 years, all models consistently overestimated future cleantech costs, while the real cost of solar fell twice as fast as the most ambitious projections.

The team then used a more accurate probabilistic model to estimate the cost of possible future energy systems based on past data for 50 different technologies, including 45 years of solar energy costs and 37 years of wind energy costs. The model showed that the potential for further reductions in green energy costs is so high that it is the best path for a post-carbon transition.

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