Respiration primarily occurs in the mitochondria, which are often referred to as the "powerhouses of the cell".

Here's a breakdown:

* Glycolysis: The first stage of respiration actually takes place in the cytoplasm of the cell.

* Krebs Cycle & Electron Transport Chain: These crucial stages of respiration occur within the mitochondria.

While glycolysis begins outside the mitochondria, the vast majority of energy production (ATP) happens inside these organelles.