To provide the body with energy requires the work of three organ systems. Which ones?

Digestive – supplies organic matter, respiratory – oxygen for the oxidation of organic matter, circulatory – for the transport of all these compounds in cells.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.