Why do our muscles get tired? Detailed answer

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Why do our muscles get tired? Detailed answer

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Why do our muscles get tired?

Muscles are responsible for the movement of the body. Every bone that can move has muscles attached to it that move it. Muscles pull the bone in the right direction, and they are capable of this action because they can contract, that is, become shorter and thicker. When they contract, they move the bone. When a muscle contracts, it releases lactic acid, which acts as a "fatigue poison", meaning it is the main reason muscles begin to feel tired. This means that when lactic acid leaves the muscles, they can continue to work again.

Thus, during the day, using our muscles in work, we "poison" ourselves with lactic acid. We are starting to get tired. There are other substances in our body that make us feel tired. They are called fatigue toxins and are produced by the body when we do physical labor. The blood carries these toxins throughout the body, and therefore not only the muscles, but the whole body, and especially the brain, begins to feel tired.

The connection between fatigue, lactic acid, and toxins is well illustrated in one interesting experiment. The dog is forced to work until he falls asleep from exhaustion. Then the blood of this dog is transfused into another, feeling cheerful and cheerful. The second dog begins to feel tired and falls asleep from exhaustion during the transfusion! And the results can be opposite if the blood of a cheerful dog is poured into a tired one: this blood will wake up an animal sleeping from fatigue. What is the significance of the appearance of a feeling of fatigue in the body?

The cells of the body need rest. When we are tired and rest, the damage done to the body is reversed: the nerve cells in the brain recharge their batteries, the joints are "lubricated" with bodily fluids, and so on. Sometimes a person during sports activities suddenly falls into a state close to fainting. He feels weak and breathes with difficulty. This is exhaustion, and it is very similar to paralysis.

The cause of this fatigue is unknown, but the condition may be caused by an excess of lactic acid and other fatigue toxins in the body.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

When was wine first introduced?

Wine is the fermented juice of grapes. For thousands of years, man has enjoyed its taste. Perhaps the first who began to make wine were Persian peasants who lived near the Caspian Sea. The Egyptians adopted the art of making wine from them in 3000 BC. The drawings on the walls of the tombs in the pyramids depict the ancient Egyptians making wine. Wine was a common drink in the daily life of the ancient Greeks and Romans. It played an important role in religious ceremonies. The Romans had Bacchus as the god of wine, while the Greeks had Dionysus.

In the 1000th century BC, the Greek conqueror Alexander the Great brought grape wine and the secrets of winemaking to Central Asia. The Greeks also brought wine to southern France. In later centuries, Roman conquerors probably brought wine to northern France and Germany. When Lei Erickson landed on the east coast of North America around XNUMX AD, he discovered so many wild grapes growing there that he named the place the land of vines.

Later Spanish conquerors and missionaries brought grapes from Europe to California. Wine was used during ceremonies in many ancient religions. And nowadays it is used in many Christian and Jewish religious ceremonies. In times when there was a lack of drinking water, it was believed that drinking wine is not harmful, but good for health.

Wine can be made from many fruits and plants that contain natural sugar. But mostly wine is made from grapes. When we say "wine" without adding the name of the fruit, such as "peach wine" or "blackberry wine", we always mean grape wine. There are more than 8 thousand varieties of grapes for making wine.

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