Here are some possibilities:
For the overall process of breathing:
* Ventilation: This term refers specifically to the movement of air into and out of the lungs.
* Gas exchange: This term emphasizes the transfer of oxygen and carbon dioxide between the lungs and the blood.
For the cellular process:
* Cellular respiration: This term is used for the metabolic process that converts glucose into ATP (energy) in the presence of oxygen.
* Oxidation: This term describes the chemical reactions involved in breaking down glucose.
Other options:
* Aerobic metabolism: This term describes the type of metabolism that requires oxygen.
* Breathing: This is a simple and common term for the act of inhaling and exhaling.
The best word to use depends on the context and what you are trying to communicate.
