Q:

In pulmonary capillary blood

0

 In pulmonary capillary blood.


  1. Carbonic anhydrase in erythrocytes catalyses the formation of H and HCO3 .
  2. Hydrogen ions dissociate from haemoglobin.
  3. The rise in PO2 is of greater magnitude than the fall in PCO2.
  4. The oxygen content is linearly related to alveolar PO2.
  5. The pH is lower than in blood in the pulmonary artery.

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

B. True Oxygenation of haemoglobin favours this dissociation.

C. True PO2 rises by at least 40 mmHg whereas PCO2 falls 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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