Cell biology: Mitochondria, aerobic respiration.
Human biology
Cellular respiration is the process through which the cell obtains energy (ATP) from breaking down nutrients, such as carbohydrates, proteins, and lipids.
So, if we want to compare an organ with the mitochondria, where most of the cellular respiration occurs, we need to look for an organ that provides energy to the body. The closest one would be the stomach, that breaks do