Here's why:
* Mitochondria are the "powerhouses" of the cell. They are responsible for cellular respiration, a process that breaks down glucose (sugar) and converts its energy into ATP.
* ATP is the main energy currency of the cell. It fuels a wide range of cellular processes, including muscle contraction, nerve impulse transmission, and protein synthesis.
While the mitochondria are the primary site, a small amount of ATP can also be produced in the cytoplasm through glycolysis, a process that doesn't require oxygen. However, glycolysis produces significantly less ATP than cellular respiration in the mitochondria.
