In pulmonary capillary blood A. Carbonic anhydrase in erythrocytes ca

1.	In pulmonary capillary blood A. Carbonic anhydrase in erythrocytes catalyses the formation of H+ and HCO3- . B. Hydrogen ions dissociate from hemoglobin. C. The rise in PO2 is of greater magnitude than the fall in PCO2. D. The oxygen content is linearly related to alveolar PO2. E. The pH is lower than in blood in the pulmonary artery.
Answer» A. False It catalyses the conversion of H₂CO₃ to CO₂ and H₂O. B. True Oxygenation of haemoglobin favours this dissociation. C. True P_O2 rises by at least 40 mm Hg whereas P_CO2falls by only 6 mmHg. D. False It follows the sigmoid oxygen dissociation curve. E. False It is higher due to the diffusion of CO₂ out of the blood to the alveoli.

In pulmonary capillary blood A. Carbonic anhydrase in erythrocytes catalyses the formation of H+ and HCO3- . B. Hydrogen ions dissociate from hemoglobin. C. The rise in PO2 is of greater magnitude than the fall in PCO2. D. The oxygen content is linearly related to alveolar PO2. E. The pH is lower than in blood in the pulmonary artery.

Answer»

A. False It catalyses the conversion of H₂CO₃ to CO₂ and H₂O.

B. True Oxygenation of haemoglobin favours this dissociation.

C. True P_O2 rises by at least 40 mm Hg whereas P_CO2falls by only 6 mmHg.

D. False It follows the sigmoid oxygen dissociation curve.

E. False It is higher due to the diffusion of CO₂ out of the blood to the alveoli.

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