Question: 166. Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?
(1) High \mathrm{pO}_{2} and High \mathrm{pCO}_{2}
(2) High \mathrm{pO}_{2} and Lesser \mathrm{H}^{+} concentration
(3) Low \mathrm{pCO}_{2} and High \mathrm{H}^{+} concentration
(4) Low \mathrm{pCO}_{2} and High temperature
Answer: Option (2)
Explanation:
Oxyhaemoglobin is formed when oxygen binds to haemoglobin in the lungs.
In the alveoli, the partial pressure of oxygen is high, which promotes the binding of oxygen to haemoglobin.
The concentration of hydrogen ions is low in the alveoli, resulting in a higher pH.
Lower \mathrm{H}^{+} concentration increases the affinity of haemoglobin for oxygen.
Therefore, high \mathrm{pO}_{2} and lesser \mathrm{H}^{+}
concentration are favourable for the formation of oxyhaemoglobin,
making option (2) correct.