Gas exchange is a biological process through which different gases are transferred in opposite directions across a specialised respiratory surface. Gases are constantly required and produced as a by-product of cellular and metabolic reactions so an efficient system for their exchange is extremely important. It is linked with respiration in animals...
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http://en.wikipedia.org/wiki/Gas_exchange
(from the article `respiration, human`) Respiratory gases—oxygen and carbon dioxide—move between the air and the blood across the respiratory exchange surfaces in the lungs. The structure ... ...breathers, which, as in the case of the water beetle Dytiscus, take on a gas supply in the form of an air bubble under their wing sur...
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http://www.britannica.com/eb/a-z/g/11
The movement of oxygen and carbon dioxide between the blood and the air in the lungs. Oxygen moves from air sacs in the lungs into the surrounding blood capillaries, while carbon dioxide passes from the capillaries into the air sacs.
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http://www.encyclo.co.uk/local/20560
Gas exchange: The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air.
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http://www.medterms.com/script/main/art.asp?articlekey=10673
The movement of gases between an organism and the environment; for example, in the lungs of many organisms including birds, the blood takes up oxygen from the air and discharges carbon dioxide and water.
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https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
Click images to enlargeMovement of gases between an organism and the atmosphere, principally oxygen and carbon dioxide. All aerobic organisms (most animals and plants) take in oxygen in order to burn food and manufacture ATP (adenosine triphosphate, which provides the energy for all cell reactions). The resultant oxidatio...
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https://www.encyclo.co.uk/local/21221
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