Manual on Human “Liquid” Research—How Much Do You Know About the Mysteries of the Human Body?

【Written at the end】

Humans are made of water, but the water content in different people is different. The weight of water in a newborn baby accounts for as much as 75% of its body weight, while an average adult has about 60% water, and some obese people have only about 45%.

A 70kg male has about 42L of water in his body, which can be divided into intracellular fluid and extracellular fluid. Intracellular fluid accounts for 2/3 of the body water, about 28L. Extracellular fluid accounts for 1/3, about 14L. Of this 14L of extracellular fluid, 4L is blood, 6L is interstitial fluid, and 4L is transcellular fluid.

· Under normal circumstances, people excrete about 2-3L of water every day through urination, sweating, breathing, etc. When a large amount of water is lost in a short period of time or the water is not replenished enough, people will become dehydrated. When the water loss reaches 2%-3% of body weight, it will be mildly dehydrated, and symptoms such as dizziness, headache and thirst will appear. If the water loss reaches 3%-6%, it will be moderately dehydrated, and symptoms of circulatory insufficiency will appear. When the water loss reaches more than 6%, it is severe dehydration, and shock and coma will occur.