$C O_{2}$ dissociates from carbamino haemoglobin when

(a) $p C O_{2}$ is high and $p O_{2}$ is low

(b) $p O_{2}$ is high and $p C O_{2}$ is low

(c) $p C O_{2}$ and $p O_{2}$ are equal

(d) None of the above

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Solution

(b) When, the $p C O_{2}$ is low and $p O_{2}$ is high as in the lung alveoli, dissociation of $C O_{2}$ from carbamino - haemoglobin takes place. $C O_{2}$ which is bound to haemoglobin from the tissue is delivered at the alveoli, to maintain the concentration of $C O_{2}$ thus increasing $p C O_{2}$ .
Exchange of gases takes place between tissue capillary and tissue cells. Capillary cells with high $p O_{2}$ causes diffusion of $O_{2}$ into tissue cells via tissue fluid on the other hand high $p C O_{2}$ in the tissue cells causes diffusion of $C O_{2}$ into tissue capillary via tissue fluid.

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