1. Water is the transport medium of nutrients and metabolic wastes in the body. The nutrient supply and metabolites of each cell and tissue are transported through the blood circulation system and lymphatic system, and water is the main component.
2. Water directly participates in human metabolism. Almost all physiological and biochemical metabolic reactions in human body need to be carried out in water environment.
3. Water plays the role of lubrication and buffering in joints, providing shockproof protection for spinal cord and maintaining normal pressure of retina and lens in eyeball.
Water is the source of many trace elements, so it is very important to ensure adequate water intake to maintain normal physiological functions of human body. The amount of drinking water needed by each person every day should be balanced with the amount of water lost, which changes due to changes in activities, environment and diet.
Water is an inorganic substance composed of hydrogen and oxygen, and it is nontoxic. At normal temperature and pressure, it is a colorless and odorless transparent liquid, which is called the source of human life. Water includes natural water, distilled water is pure water and artificial water.
Water is one of the most common substances on the earth, an important resource for all life, including inorganic compounds and human beings, and the most important component of organisms. Water plays an important role in the evolution of life.