The main energetic substance of cells.

The main energetic substance in the cell is ATP. ATP is stored during the oxidation of organic matter by the mitochondria of the cell. Mitochondria are membrane organelles that provide the oxygen stage of energy metabolism. Mitochondria are oxidized primarily by carbohydrates. The main carbohydrate is glucose. Also, lipids have an important energy function. They can provide the body with energy by 50-90%. If there are not enough lipids and carbohydrates, then mitochondria begin to oxidize proteins, since the cell needs energy.