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Carbonic acid gas --> carbon dioxide

(Science: biochemistry, physiology) a metabolic byproduct of carbohydrate metabolism. Carbon dioxide collects in the tissues, is cleared by the blood (via the veins) and removed from the body via the lungs when we exhale air.

Abbreviation: co2 a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis.