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Which reactions is catalyzed by carbonic anhydrase in the red blood cell when it reaches the...

Which reactions is catalyzed by carbonic anhydrase in the red blood cell when it reaches the lung?

1. H+ +HCO3->H2CO3

2. H2CO3 ---->H+ + HCO3-

3. H2CO3->CO2+H20

4. CO2 + H20 -> H2CO3

science   Anatomy-And-Physiology   
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Answer #1

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Option 3) H2CO3 \rightarrow CO2 + H2O

  • When red blood cell reaches lungs in pulmonary capillary, H2CO3 is converted to carbon dioxide and water.
  • Carbon dioxide diffuses into the alveoli as its concentration is higher in pulmonary capillary as compared to the alveoli.
  • The conversion of H2CO3 into CO2 + H2O is catalyzed by carbonic anhydrase.
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