* Mitochondria: The powerhouse of the cell. Most of the ATP (energy currency of the cell) is produced here through the electron transport chain and oxidative phosphorylation. This process utilizes oxygen to break down glucose and generate energy.

* Cytoplasm: The fluid that fills the cell. The initial stages of aerobic respiration, glycolysis, occur in the cytoplasm. Glycolysis breaks down glucose into pyruvate, which is then transported to the mitochondria.

While these two organelles are the primary sites for aerobic respiration, it's worth noting that some steps of the process, like the conversion of pyruvate to acetyl-CoA, occur in the mitochondrial matrix, the space enclosed by the inner membrane.