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Transport of Carbon Dioxide

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Question

Read the following statements and find out the incorrect statement $(s) .$
$a .$ The binding of $C O_{2}$ with haemoglobin is related to the partial pressure of $C O_{2} . p O_{2}$ is a major factor which could affect this binding.

$b .$ When $p C O_{2}$ is low and $p O_{2}$ is high as in the alveoli, more binding of $C O_{2}$ occurs, whereas when the $p C O_{2}$ is high and $p O_{2}$ is low as in the tissues, dissolution of $C O_{2}$ from carbaminohaemoglobin takes place.

$c .$ At the tissue site, where partial pressure of $C O_{2}$ is high due to catabolism, $C O_{2}$ diffuses into blood $(R B C s and plasma)$ and forms $H C O_{3}^{-}$ and $H^{+} .$ At the alveolar site where $p C O_{2}$ is low, the reaction proceeds in the opposite direction leading to the formation of $C O_{2}$ and $H_{2} O .$
$d .$ Oxygen dissociation curve is highly useful in studying the effect of factor like $p C O_{2}, H^{+}$ concentration, etc., on binding of $O_{2}$ with haemoglobin.

c

and

d

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b

only

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a

and

b

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b

and

c

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Solution

The correct option is B $b$ only
Statement $b$

When $p C O_{2}$ is low and $p O_{2}$ is high as in the alveoli, more binding of $C O_{2}$ occurs, whereas when the $p C O_{2}$ is high and $p O_{2}$ is low as in the tissues, dissolution of $C O_{2}$ from carbaminohaemoglobin takes place.

Elaboration

The partial pressures of $O_{2}$ and $C O_{2}$ play a major role in binding of these gases with haemoglobin. In the alveoli, the partial pressure of $O_{2}$ is higher than that of $C O_{2} .$ This causes the dissociation of $C O_{2}$ from the carbaminohaemoglobin.

Hence this statement is incorrect.

$Final Answer:$

$D$ only

Suggest Corrections

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

What will be the pO₂ and pCO₂ in the atmospheric air compared to those in the alveolar air?

(i) pO₂ lesser, pCO₂ higher

(ii) pO₂ higher, pCO₂ lesser

(iii) pO₂ higher, pCO₂ higher

(iv) pO₂ lesser, pCO₂ lesser

C O_{2}

P_{c o_{2}}

P_{o_{2}}

C O_{2}

In the tissues, the factors favourable for the dissociation of $O_{2}$ from oxyhaemoglobin are

$a .$ Low $p O_{2}$

$b .$ High $p O_{2}$

$c .$ Low $p C O_{2}$

$d .$ High $p C O_{2}$

$e .$ Lower temperature

$f .$ Higher temperature

$g .$ Low $p H$

$h .$ High $p H$

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