Water plays an important role in the evolution of life. People's understanding of aquatic products has a long history. In China's ancient and western simple material views, water was regarded as the basic component, and water was one of the five elements in ancient China. There was also water in the four-element theory of ancient western countries.
Life originated from the vast ocean, and the Chinese character "sea" is composed of people, water and mother. The formation of this word shows China people's understanding of the relationship between man and water. Water is called ARCHE in Greek, which means the mother of all things. Everything born of water, the mother of all things, will rot, destroy and disappear in the passage of time, but water has no fixed shape, so it can return, which may be the root of human thinking about water!
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Water is not only the main component of human body, but also has many physiological functions. The solubility of water is very strong, and many substances can be dissolved in water and dissociated into ionic states, which plays an important role. Insoluble egg protein and fat can be suspended in water to form colloid or emulsion, which is convenient for digestion, absorption and utilization; Water directly participates in the redox reaction in human body, promoting various physiological activities and biochemical reactions; Without water, it is impossible to maintain physiological activities such as blood circulation, breathing, digestion, absorption, secretion and diarrhea, and metabolism in the body cannot be carried out; Water has a large specific heat, which can regulate body temperature and keep it constant.
When the outside temperature is high or the body generates a lot of heat, evaporation and sweating of water help to dissipate heat. When the weather is cold, mountains have great potential to store heat in water, so that the human body will not be cooled by the cold outside, and the water has great mobility. On the one hand, it can transport oxygen, nutrients, hormones and so on. On the other hand, it can excrete metabolites and toxic substances through defecation, urination and sweating. Water is also a self-contained lubricant in the body, such as skin moisturizing. Tears, saliva, joint capsule and serous cavity fluid are all lubricants for corresponding organs.