Why do people drink water?

Human life depends on the existence of water. Not only is there water in people's external environment (including various forms), but also there is no shortage of water in people's interior.

1, human blood circulation needs water.

2. Human metabolism needs water.

3. Water is needed to resist external atmospheric pressure.

Therefore, when the human body is short of water, it is necessary to drink water, so that you will not die of some mechanism of water shortage.