Water-salt exchange

In the cells of the human body, about 72% of water (about 2/3 of body weight), 28% is part of the blood, lymph, intercellular fluid. Water performs transport, excretory, heat-regulating functions. It is a medium for chemical reactions and determines the physical properties of the cell. The need for water in an adult is 2-3 liters per day.

Water enters the body with food and liquids (water, tea, juices and other drinks).
In the cells of the human body, metabolic water is formed (as a product of the oxidation of organic compounds). Normal water exchange involves a balance between the amount of absorbed and released water. Water is excreted from the body with sweat, urine, in the form of water vapor, through the intestines.

The need for water (thirst) stimulates the drinking center in the brain (in the hypothalamus), and the satisfaction of thirst inhibits this center.

Mineral salts are an important component of the human body. Salts are involved in maintaining the pH of the internal environment of the body, the processes of excitability of the nervous and muscle tissues, and form the basis of the intercellular substance of bone tissue.
Every day the body needs salts of calcium, sodium, potassium, chlorine, phosphorus, iron and other elements.

Example:
calcium salts are necessary in the process of blood coagulation, potassium and calcium are involved in the mechanism of muscle contraction, etc.
Common foods are the source of mineral salts. They contain in sufficient quantities all the minerals necessary for the body, with the exception of sodium chloride, which is added to food (table salt).

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