Water is the foundation of life. Water participates in the physiological function of human body, and it is the most abundant component in human body, which is recognized by various schools. Body fluid accounts for about 70% of human body weight and is necessary to maintain normal physiological functions. As long as 15% water is lost, it will be life-threatening. Nothing is more important than water in the food we eat through the mouth. According to the research of physiologists, people can live for four weeks or even two and a half months without eating, but if they don't drop water, they can only endure for up to three days at room temperature. If it is a hot summer, I'm afraid they can't stand it for even a day and a half. People in the plight of isolation, as long as there is water, life will be long. If they are sick and can't eat, the first thing they need is water.
According to the water content in the body, cerebrospinal fluid is the most, accounting for about 99%; Followed by lymph glands, accounting for about 94%; Water in blood accounts for about 83%; Water in muscles accounts for about 77%, while bones are hard, but they also contain 20% water. The above refers to the adult body, and children account for about 80% of the whole body on average. Dry mouth is a signal that the human body needs water, and we often drink water at this time. In fact, our bodies are dehydrated at this time. The bad habit of drinking water after dry mouth can easily lead to frequent dehydration of our bodies, which will subsequently endanger our health. To sum up, the physiological functions of water in human body mainly include:
1. Help digestion: The food we eat every day must be chewed by our teeth and moistened by saliva before it can be completely digested and absorbed through our esophagus and stomach. All these processes need the help of water. If there is no water, the digestive function cannot be completed.
2. Waste excretion: residues and wastes left after food digestion and absorption must be excreted through sweat, breathing and defecation. Although the excretion methods are different, they all need water to help them go smoothly.
3. Lubrication of joints: If there is no lubricating fluid in human joints, the friction between bones will make joints inflexible, and water is the source of joint lubricating fluid.
4. Balance body temperature: There is a close relationship between water and body temperature. When the weather is cold, blood vessels contract, the blood flow to the skin decreases, and water is not easily discharged, so that the body temperature can be balanced. In summer, blood vessels dilate and the amount of blood flowing to the skin increases. At this time, water also flows to the skin through the blood, and then is discharged from the skin surface by sweat glands. Because sweat evaporates, the heat on the skin surface is reduced, which can keep the body temperature balanced.
5. Cell maintenance; The human body is made up of countless cells, most of which are water, and only water can maintain the metabolism of the skin.
6. Lymphatic fluid and blood: The transportation of nutrients, the excretion of wastes and the circulation work are all driven by water, and the activities of all parts of the human body and the metabolism of every organ also need water to maintain. So the best way is to pay attention to properly replenish water and avoid dehydration. Otherwise, the body will continue to lack water, the metabolism will not be smooth, and the body function will gradually decline. According to the needs of the human body, medical experts believe that the average daily intake of 2.5 liters is appropriate. The water needed by the human body is obtained from drinking water first, and then from food. When enough water is ingested, the circulation of blood and lymph will be in a good state. Only in this way can we ensure the supply of nutrients needed by the body, dissolve waste and eliminate toxins, thus improving the function of internal organs and making the skin moist and smooth. This is necessary for the health of young people and children, especially for the elderly.