It is a metabolic process that takes place in cells of organisms by which they use oxygen to break down glucose and produce ATP.
It provides the chemical energy required for the functioning of cells.
Importance of oxygen in cellular respiration:
Oxygen is required in the cellular respiration in the electron transporter chain.
It serves as the final electron acceptor of the electron transport chain facilitating the movement of electrons down the chain hence producing the ATP or adenosine triphosphate.
Oxygen combines with the electrons and the hydrogen ions to form water which is a byproduct of the process.