Meaning & use
internal respiration
The exchange of oxygen and carbon dioxide between the blood and the body's tissue cells.
See it in a sentence
Internal respiration occurs at the cellular level, as oxygen moves from capillaries into surrounding tissue.
The biology textbook contrasted internal respiration with external respiration, which happens in the lungs.
A note on using this word
Internal respiration is a cellular process, distinct from external respiration, which is the exchange of gases between the lungs and the air.
Words with a similar meaning
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