A ratio of the volume of air that reaches the alveoli to the volume of blood supplying the alveoli. Gas exchange in the lungs is most efficient when there is a good match between ventilation and perfusion; an imbalance can cause anoxia and cyanosis.
ventilation-perfusion ratio
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 | perfusion |
| Zones of the lung |
| Alveolar-arterial gradient |
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 | Sports Science and Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved. Read more |
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