Cells use enzymes to oxidize foods in the metabolic pathway known as oxidative phosphorylation, electron transport-linked phosphorylation, or terminal oxidation, which releases chemical energy to create adenosine triphosphate.
This happens inside mitochondria in eukaryotes.
The fourth step of cellular respiration, oxidative phosphorylation, generates the majority of the energy.
Mitochondria:
In the mitochondria's inner membrane oxidative phosphorylation takes place.
The intermembrane gap and the mitochondrial matrix are where the proton gradient is produced.
The oxidation of substrates and the synthesis of ATP are processes that are connected during oxidative phosphorylation, which takes place in the mitochondria of all animal and plant tissues.
The two carrier molecules NAD or FAD transfer hydrogen ions (or electrons) to the electron transport pumps as the Kreb's cycle is running.