Here's how it works:
1. Cellular Respiration: The process of breaking down food (glucose) in the presence of oxygen is called cellular respiration. It occurs in the cells of all living organisms.
2. Glycolysis: The first stage of cellular respiration breaks down glucose into pyruvate, producing a small amount of ATP.
3. Krebs Cycle: The pyruvate is further broken down in the Krebs Cycle, generating more ATP and electron carriers (NADH and FADH2).
4. Electron Transport Chain: The electron carriers deliver their electrons to the electron transport chain, where a series of reactions occur, creating a proton gradient across the mitochondrial membrane.
5. ATP Synthesis: This proton gradient drives the production of ATP through a process called oxidative phosphorylation.
In summary, the energy released during the breakdown of food is captured in the chemical bonds of ATP, which is then used by the cell to power its activities.
