Approximately 70% of carbon dioxide absorbed | vedclass

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Question

(A) Approximately $70\%$ of $CO_2$ (about $2.5 \ ml$ per $100 \ ml$ of blood) received by the blood from the tissues enters the $RBCs$,where it reacts

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as bicarbonate ions

Vedclass · Answer

(A) Approximately $70\%$ of $CO_2$ (about $2.5 \ ml$ per $100 \ ml$ of blood) received by the blood from the tissues enters the $RBCs$,where it reacts with water to form carbonic acid $(H_2CO_3)$.Carbonic anhydrase,an enzyme found exclusively in $RBCs$,speeds up the formation of $H_2CO_3$ and rapidly converts it back to carbon dioxide and water when the blood reaches the lungs.Almost as rapidly as it is formed,the carbonic acid in $RBCs$ dissociates into hydrogen ions $(H^+)$ and bicarbonate ions $(HCO_3^-)$.These bicarbonate ions are then transported in the plasma to the lungs.

Approximately $70\%$ of carbon dioxide absorbed by the blood is transported to the lungs:

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