external respiration
Biology/physiology term for the exchange of gases between an organism and its environment, often contrasted with 内呼吸 (internal respiration).
See also: 内呼吸
The lungs are organs responsible for external respiration.
In biology class, we learned the difference between external respiration and internal respiration.
Compound of 外 (outside, external) and 呼吸 (respiration, breathing).