Where Bicarbonate is converted into carbonic acid

In the RBC of capillaries around the lungs

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In the body fluid

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in the arcolar cavity of lungs

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In the RBC of blood capillaries around body tissue

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Solution

The correct option is A In the RBC of capillaries around the lungs
Carbonic anhydrase, which is found within the red blood cells, catalyzes a reaction converting $C O_{2}$ and water into carbonic acid, which dissociates into protons and bicarbonate ions. This reaction occur in the RBCs of capillaries around the lungs.
So the correct option is 'In the RBCs of capillaries around the lungs'.

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