Given below are two statements about transport of O 2 and CO 2 . Statement (I): In the alveoli, where ppO 2 is high and ppCO 2 is low, the oxygen binds to haemoglobin. Statement (II): In the a

Question

Given below are two statements about transport of $O_{2}$ and $CO_{2}$ .
Statement (I): In the alveoli, where $ppO_{2}$ is high and $ppCO_{2}$ is low, the oxygen binds to haemoglobin.
Statement (II): In the alveoli under low $ppCO_{2}$ , hydrogen ion and bicarbonate ions recombine under the influence of the enzyme carbonic anhydrase and release $CO_{2}$ .
In light of the above statements, choose themost appropriateanswer from the options given below.

TestHub · Accepted Answer

Statement (I) is correct. In the alveoli, the partial pressure of oxygen ( $pO_{2}$ ) is high and the partial pressure of carbon dioxide ( $pCO_{2}$ ) is low. Along with lesser $H^{+}$ concentration and lower temperature, these factors are highly favourable for the binding of oxygen with haemoglobin to form oxyhaemoglobin.

Statement (II) is correct. At the alveolar site where $pCO_{2}$ is low, the reaction catalyzed by the enzyme carbonic anhydrase proceeds in the reverse direction. Bicarbonate ions ( $HCO_{3}^{-}$ ) and hydrogen ions ( $H^{+}$ ) recombine to form carbonic acid, which then dissociates to release $CO_{2}$ and $H_{2} O$ .

Therefore, both Statement (I) and Statement (II) are correct.

Answer: Both Statement (I) and Statement (II) are correct.

Biology - Breathing and Exchange of Gases Question with Solution | TestHub

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