respiration

This term describes the physiological act of gas exchange, carrying a clinical and scientific tone. It is more formal than breathing, which is used in everyday conversation to describe the physical movement of air. In a medical context, it often refers to the measurable rate or quality of a patient's breath.

In biological sciences, the term expands beyond the lungs to describe the metabolic process occurring at a cellular level. This chemical respiration is the mechanism by which organisms convert nutrients into energy, distinguishing it from the mechanical act of inhaling and exhaling.