The human body, like all living things, is a flow system: it feeds, breathes and excretes waste. What does a person get from the living

The human body, like all living things, is a flow system: it feeds, breathes and excretes waste. What does a person get from the living and inanimate nature surrounding him? What happens to all this in the human body? What sciences give us the necessary knowledge about this?

Sciences that give us knowledge about the work of the human body – anatomy, physiology, hygiene. A person eats, food enters the digestive system, where it changes. All substances and energy necessary for the body enter the bloodstream and are carried throughout the body. Waste solids are removed from the body through the end of the digestive system, liquid waste is removed through the kidneys. Food is a building material for growth, a source of energy for the work of all organs and systems of human organs. The respiratory organs provide the body with oxygen for many chemical reactions in the cells and for removing excess carbon dioxide.