Can we control hunger and thirst? Detailed answer

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Can we control hunger and thirst? Detailed answer

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Can we control hunger and thirst?

When you are thirsty, you feel dryness in your throat. And when you want to eat, it seems to you that you have an emptiness in your stomach. But in fact, neither the first sensation in the throat, nor the second - in the stomach are the causes that cause hunger and thirst. Your blood normally contains a certain amount of water and salt. The same applies to body tissues. Now imagine that this balance is disturbed for some reason. Then the blood, in order to maintain this balance, is forced to take water from the tissues, which is immediately noted in your brain in the "thirst center". This center sends an impulse to the throat, causing it to contract. This response causes a feeling of dryness in the mouth - and you begin to feel thirsty.

The feeling of hunger also occurs in the brain. There is a "hunger center" that controls the functioning of the stomach and intestines. When there are enough nutrients in the blood, the hunger center slows down the work of the stomach and intestines. But if these substances are not enough in the blood, the hunger center "releases the brakes." The intestines begin to contract intensively, and we feel a feeling of hunger. Our stomach begins to growl.

To some extent, we can control our feelings of hunger by determining the rate at which our body consumes the food reserves it has. In nature, small animals leading an active lifestyle spend their reserves faster than anyone else. For example, small birds starve to death in five days, and a dog can live without food for twenty.

Much depends on the state of the body. When a person is calm, the supply of protein in his body is enough for a longer period than when he is excited or scared. Some people train their bodies to go without food for long periods of time. They achieve this by willpower, just as athletes can force their bodies to perform the most difficult exercises. It is much more difficult to control the feeling of thirst, but by an effort of will you can accustom yourself to endure thirst for some time.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Which ocean creature is the noisiest?

Shrimp.

And although the blue whale makes the loudest sound of all individual animals in the water and on land, it is the shrimp that makes the loudest natural noise in nature.

Shrimp layer noise is the only natural noise that can "blind" a submarine's sonar, deafening the acoustics through headphones.

Being under the shrimp layer, the hydroacoustic does not hear what is happening above it, and vice versa. Audibility from under the layer of shrimp can be ensured in only one way: raise the mast through it.

The noise level produced by a crowd of shrimp reaches a deafening 246 decibels. Even though sound travels faster in water, it equates to 160 decibels in air—much louder than the sound of a jet plane taking off (140 dB) or the human threshold for pain. Some observers have given the following comparison: it is as if all the inhabitants of our planet at the same time undertook to fry bacon in a pan.

The noise comes from trillions of shrimp clicking their single "oversized" claw at the same time. Snapping shrimp, a variety of Alpheus and Synalpheus species, are found in the shallow waters of the tropics and subtropics.

The way it all happens is even more interesting than how it all sounds. In a video shot at 40 frames per second, you can clearly see that the sound occurs 000 microseconds after the claw closes. It turns out that the noise is produced not by the click of the claw, but by the bursting of the bubble - an effect known to science as "cavitation".

How does all this look? A small tubercle on one side of the claw fits into a depression on the other side. The claw closes so quickly that a trickle of water shoots out of it. At the same time, the speed of the water stream reaches 100 km / h - it is quite enough for the formation of expanding bubbles of water vapor. When the water slows down and the pressure returns to normal, the bubbles burst, producing intense heat (up to 20°C), a loud bang, and light, the latter being considered a rather rare phenomenon and called "sonic luminescence", i.e. when sound generates light.

Shrimp use their noise to stun prey, as well as to communicate and find sexual partners. In addition to disabling sonar, this harsh and intense sound leaves dents in ships' propellers.

Test your knowledge! Did you know...

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