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Overview[edit] A carbonic anhydrase, or carbonate dehydratase, is a type of enzyme that rapidly catalyzes the conversion of carbon dioxide into a proton and the bicarbonate ion (HCO3-).
Bicarbonate is CO 2 - with an OH group attached. When the bicarbonate reaches the lungs, it is transformed back to carbon dioxide, so it can be exhaled from the body. Carbonic anhydrase converts carbon dioxide to bicarbonate in a reversible reaction, primarily in red blood cells.