Ncert Exercises & Solutions

Carbon dioxide dissociates from carbaminohaemoglobin when

1. pCO₂ is high and pO₂ is low
2. pO₂ is high and pCO₂ is low
3. pCO₂ and pO₂ are equal
4. None of the above

(b) When, the PCO₂,is low and pO₂ is high asin the lung alveoli, dissociation of carbondioxide from carbamino-haemoglobin takes place,carbondioxide which is bound to haemoglobin from the tissue is delivered at the alveoli, to maintain the concentration of carbondioxide thus increasing p carbondioxide.
Exchange of gases takes place between tissue capillary and tissue cells. Capillary cells with high pCO₂ causes diffusion of oxygen into tissue cells via tissue fluid on the other hand high pCO₂ in the tissue cells causes diffusion of carbondioxide into tissue capillary via tissue fluid.

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