Is water important to humans? Tell us why! !

1. Water plays an important role in our lives. It is the source of life and one of the most important material resources indispensable for human survival and development. Human life cannot be separated from water for a moment. Water is the most important substance needed for human life. The physiological functions of the human body are multifaceted, and all chemical reactions that occur in the body are carried out in medium water. Without water, nutrients cannot be absorbed; oxygen cannot be transported to the required parts; nutrients and hormones cannot reach it. Action site; waste cannot be eliminated, metabolism will stop, and people will die. Therefore, water is the most important substance to human life. On earth, wherever there is water, there is life. All life activities originate from water. The water in the human body accounts for approximately 65% ??of the body weight. Among them, the brain contains 75% water, the blood contains 83% water, the muscles contain 76% water, and even the hard bones contain 22% water! Without water, nutrients from food cannot be absorbed, waste cannot be excreted, and medicines cannot reach the site of action. Once the human body is dehydrated, the consequences will be serious. A dehydration of 1%-2% will make you feel thirsty; a dehydration of 5% will cause dry mouth, wrinkled skin, confusion, and even visual hallucinations; a dehydration of 15% is often worse than hunger. People can live for a long time without food (some estimates are two months). If there is no water, they can live for about a week at most. 2. In modern industry, there is no industrial sector that does not use water. There is no industry that is not directly or indirectly related to water. More industries use water to cool equipment or products, such as steel plants. Water is often used as a detergent, such as rinsing raw materials or products, cleaning equipment or floors. Every factory must use various functions of water to maintain normal production. Water is involved in almost every production link. Therefore, water, as a precious wealth given to mankind by nature, has long been paid attention to. However, people often use the term "water resources" only in the past ten or twenty years. There are dozens of definitions of water resources. The more common definition refers to "the amount of water that can be used regularly by people and restored year by year." It is also commonly referred to as freshwater resources. In this way, the brackish seawater is not included, and even the glaciers that have been difficult to melt for thousands of years and some groundwater that is not easy to access are also excluded. Elucidated resources are the resources that are most clearly understood by human surveys. They will never change the quantity structure and distribution like coal, iron, oil and other resources with new discoveries. The value of water resources lies in the needs of life on earth and its ability to serve human beings, including water's ability to generate electricity, shipping, breeding, and the environment. We all know that water is an extremely important and active factor in the natural environment and social environment. Beautiful mountains and clear waters, chirping birds and fragrant flowers, smooth weather and abundant grains are the beautiful scenery that human beings pursue and yearn for, and they are also the fruits of human labor creation and careful care. Water is constantly moving, in the human body, in farmland, and in factories, making the world full of life and vitality. The dirt is taken away by the water flow, diluted, dissolved, and purified by nature. When we wander in the embrace of nature, in fact, all we face is the power given to us by water. In our life of mountains, trees and water, water gives us a large proportion. The earth is known as the "water ball". "Three mountains, seven waters, and one farmland" is a common saying that vividly summarizes the situation on the earth's surface. According to authoritative estimates, the amount of water stored on the earth reaches 385 million cubic kilometers. If these were spread horizontally on the surface of the earth, the earth would become a "water ball" with an average water depth of more than 2,700 meters. When sailing in the sea, although the waves lift you up and the waves play with you, you dare not drink a little bit of the sea water, even if you are so thirsty that your voice is smoking and your lips are chapped. 97% of the water on the earth is this kind of seawater that humans cannot drink directly