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gas exchange

   Also found in: Medical, Legal, Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
gas exchange
The diffusion of gases from an area of higher concentration to an area of lower concentration, especially the exchange of oxygen and carbon dioxide between an organism and its environment. In plants, gas exchange takes place during photosynthesis. In animals, gases are exchanged during respiration.


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The deciduous red or river birch (Betula occidentalis) has smooth coppery bark highlighted with white lenticels or slits which facilitate gas exchange between the trunk's interior cells and the outside air.
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As the symptom - fibrosis of the alveolar walls - progresses, gas exchange in the lungs, the exchange of oxygen and carbon dioxide,
Shionogi Reports Results of Phase III Clinical Trials of the ... by JCNN News Summaries
For example, mixing affects gas exchange between the atmosphere and the water.
Krill kick up a storm of ocean mixing by Milius, Susan / Science News
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