It takes ten minutes for a person to drink water until the body recovers from lack of water. Why can he quench his thirst just by drinking water?

2021-01-11 | Alber Smith Original |

When people drink water after being thirsty, it takes a certain time for the water to be absorbed by the body, about 10~15 minutes to restore the body's dehydration state; however, we just drink water to eliminate thirst, this is because the body is thirstyThe feedback mechanism with drinking water is quite complete, and drinking water can directly suppress the excitement signal of thirst.

About 70% of the weight of an adult's body is water. Water controls the osmotic pressure in the human body. When our body begins to lack water, the brain will send out a signal of thirst, telling us that we need to drink water. If the lack of water is serious, it will causeDehydration, even death.

A study by a professor of biology at California Institute of Technology reveals the regulation mechanism of thirst and drinking. The researchers used the latest technology to mark specific neurons in mice, and then studied the mice’s thirst and the nerves when drinking waterChanges in the yuan.

In the mouse's brain, there are three regions involved in thirst regulation mechanism, namely SFO, MnPO and OVLT. The three regions have neurons that stimulate drinking water. Among them, SFO and OVLT are connected to the blood and can sense blood.Changes in the concentration of sodium in the blood, and the concentration of sodium in the blood is closely related to body water.

The study found that the MnPO area can receive the thirst signal from the SFO, and then transmit the signal to the upper brain. If the MnPO area fails, no matter how to stimulate the SFO and OVLT areas, it will not cause the drinking behavior of the mice;If the MnPO area of ​​the mouse is stimulated alone, regardless of whether it is really dehydrated, it will trigger the drinking behavior of the mouse.

It takes about ten minutes from drinking water to the normal level of blood water content. In order to solve the time difference during this period, when drinking behavior occurs, the inhibitory nerves in the MnPO area will be activated, temporarily suppressing the thirst signal from SFO, so the brainI won’t feel thirsty!

The study also found that the inhibitory circuit may be related to the swallowing activity of the oral cavity. The action of the oral cavity swallowing liquid and solid is different, and the inhibitory signal generated during the drinking process makes the brain feel satisfied for the longest time. The studyIt cannot be ruled out that there are other ways to generate signals that suppress thirst. For example, visual signals can also suppress thirst to a certain extent. This is why the term "wangmei quenches thirst" is available, but the satisfaction is not long.

So our drinking behavior after being thirsty can directly inhibit the thirst signal in the brain, instead of relying on the osmotic pressure in the blood to relieve the thirst signal.

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Alber Smith
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