You’ve probably heard the advice to drink eight glasses of water a day. Which shows the importance of water to us. But…why water is so necessary and important?
drink water=maintain life
Apart from eating, an adult needs to drink about 1.5 liters of water every day.
A man who gets lost in the desert will not die without food for a week or even half a month. But when he doesn’t drink water for three days, he can’t sustain life. Why do we drink water? What important role does water play in people’s lives?
The water contained in the adult body occupies 60-70% of the body weight, which is an important part of our body; the younger the age, the greater the percentage of water in the body, the water content in the body of a newborn baby is about 75% of the body weight.
Two-thirds of the total body fluid is distributed in cells, accounting for about 40% of body weight.
An adult secretes 6-8L of digestive juice every day, 99% of which is water. Water acts as a vehicle for enzymes in digestive juices, which can break down food in the small intestine into nutrients that can be absorbed by humans. Digested nutrients are dissolved in water so that they can enter the bloodstream through the small intestine wall.
55% of blood is plasma, and 90% of plasma is water. Therefore, more than half of the blood is water.
The nutrients absorbed from the small intestine will be dissolved in the blood before they can be transported to the whole body. Not only nutrients but also metabolites waste from the cells need to pass through the blood before being excreted from the body. Also, blood is metabolized, for example, the average lifespan of red blood cells is 120 days. It can be seen that we need a lot of water, it is impossible to live without water.
For metabolism, we must talk about the main excretory organ of our body – the kidneys. In the human body, its displacement is always the first. A normal person excretes 1-2L of water through urine every day.
Conclusion:
People can go without food for three days but not without water for three days. Because if you do not eat, you may rely on the energy stored in the body to maintain your life. In the case of extreme hunger, energy can also be obtained by consuming the body’s structural proteins. But the water in the human body is always in a state of balance, and our body does not store water! Even if we do not eat or drink, our metabolism will still proceed, so a certain amount of urine will still be excreted every day. If the human body loses water up to 20%, it will cause blood circulation dysfunction and endanger life.
Other language versions:
Chinese version :http://add-bird.com/?p=3342
Reference:<<十萬個為什麼-新視野版>>
Could you make more English passages about health, biology and economics ? I would love to read them! >< (I hope it’s related to f4 syllabus)
Ok of course! I would try my best if I have free time!
Your grammar is terrible
I agree with your idea.
Thank you for the feedback, I will try my best to improve it. No one master everything when they just arrived the world.