Cellular respiration is the process by which organisms use oxygen to break down food molecules to obtain chemical energy for cell functions.
Oxidative phosphorylation is the final step of cellular respiration.
The process of oxidative phosphorylation occurs at the inner mitochondrial membrane, consumes oxygen, and phosphorylates ADP (Adenosine diphosphate) to form ATP (Adenosine triphosphate) molecules.
Finally, this ATP is used to power various molecular reactions throughout the body that produce heat.