$C O_{2}$ dissociates from carbaminohemoglobin when

p C O_{2}

and

p O_{2}

are equal

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p O_{2}

is high and

p C O_{2}

is low

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None of the above

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p C O_{2}

is high and

p O_{2}

is low

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Solution

The correct option is B $p O_{2}$ is high and $p C O_{2}$ is low
$p C O_{2}$ is high and $p O_{2}$ is low :

High $p C O_{2}$ and low $p O_{2}$ in tissues favour the formation of carbaminohemoglobin. Hence, the dissociation of $C O_{2}$ from carbaminohemoglobin will not occur.

$p O_{2}$ is high and $p C O_{2}$ is low :

$O_{2}$ is the dominant gas in alveoli [partial pressure of $O_{2}$ is high in alveoli] compared to $C O_{2}$ . Also, the concentration of hydrogen ions is low there which favors the oxygenated state of hemoglobin ( $R$ -state). As a result, $C O_{2}$ is dissociated from $H b$ and oxyhaemoglobin is formed. In this way, $C O_{2}$ is exhaled out of the alveoli when the carbaminohemoglobin carried by the $R B C$ reaches the lungs.

$p C O_{2}$ and $p O_{2}$ are equal :

When the partial pressure of both the gases, $p C O_{2}$ and $p O_{2}$ are equal, they will remain in equilibrium. Hence, no dissociation of carbon dioxide from carbaminohemoglobin will take place.

Final answer : b. $p O_{2}$ is high and $p C O_{2}$ is low

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Similar questions

$C O_{2}$ 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

(d) None of the above

C O_{2}

C O_{2}

Bulk of carbon dioxide $(C O_{2})$ released from body tissues into the blood is present as

Carbon dioxide dissociates from carbaminohaemoglobin when

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