Here's a breakdown:

* Cellular respiration is the process by which cells break down glucose (sugar) in the presence of oxygen to release energy in the form of ATP (adenosine triphosphate).

* Oxygen acts as the final electron acceptor in the electron transport chain, the last stage of cellular respiration. This process is vital for the production of ATP, which is the primary energy currency of cells.

Let me know if you'd like to know more about cellular respiration!