KCET · BIOLOGY · STD 11 - 14. Breathing and Exchange of Gases
Which of the following factors is favourable for the formation of oxyhaemoglobin in the alveoli of human lungs?
- A High \(pCO _2\)
- B Lower temperature
- C High \(H ^{+}\) concentration
- D Low \(pO _2\)
Answer & Solution
Correct Answer
(B) Lower temperature
Step-by-step Solution
Detailed explanation
(B) Lower temperature,
In the alveoli, where there is high \(pO _2\), low \(pCO _2\), lesser \(H ^{+}\)concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin, whereas in the tissues where low \(pO _2\), high \(pCO _2\), high \(H ^{+}\) concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin. This clearly indicates that \(O _2\) gets bound to haemoglobin in the lung surface and gets dissociated at the tissues.
In the alveoli, where there is high \(pO _2\), low \(pCO _2\), lesser \(H ^{+}\)concentration and lower temperature, the factors are all favourable for the formation of oxyhaemoglobin, whereas in the tissues where low \(pO _2\), high \(pCO _2\), high \(H ^{+}\) concentration and higher temperature exist, the conditions are favourable for dissociation of oxygen from the oxyhaemoglobin. This clearly indicates that \(O _2\) gets bound to haemoglobin in the lung surface and gets dissociated at the tissues.
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