Describe the role of vitamins in the life of the human body. What vitamin is formed in the skin and under what conditions?

1) Vitamins – biologically active substances, are components of enzymes, thereby affecting the metabolism.
2) Vitamin D is formed in the skin, the condition – exposure to ultraviolet radiation – tan.
3) The value of vitamin D – provides the formation of bone tissue (assimilation of Ca salts), the exchange of calcium and phosphorus

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