Here's how it works:
* Chemical energy source: Cells use glucose, a sugar molecule, as their primary source of chemical energy.
* Breakdown: Glucose is broken down through a series of chemical reactions in a process called glycolysis. This produces a small amount of ATP (adenosine triphosphate), the cell's energy currency.
* Krebs cycle and electron transport chain: In the presence of oxygen, the breakdown products from glycolysis enter the Krebs cycle and electron transport chain. This process generates a significantly larger amount of ATP.
In essence, cellular respiration takes the chemical energy stored in glucose and converts it into a usable form of energy (ATP) that cells can use to perform their functions.
