Assertion : In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.
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Oxygen binds to haemoglobin to form oxyhaemoglobin. While some \(CO_{2}\) can bind to it (carbaminohemoglobin), its primary high-affinity role is for Oxygen.
Both, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.
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The Correct Option isC
Solution and Explanation
Step 1: Understanding the Concept:
Haemoglobin is a protein in red blood cells that transports gases between the lungs and the tissues. Step 2: Detailed Explanation:
- Assertion: True. Haemoglobin is indeed the respiratory pigment in humans that carries oxygen to all cells.
- Reason: False. Haemoglobin has a very high affinity for oxygen, not carbon dioxide. Most carbon dioxide is transported in the dissolved form in blood plasma or as bicarbonates because \(CO_{2}\) is more soluble in water than oxygen is. Step 3: Final Answer:
The assertion is correct, but the reasoning is biologically incorrect regarding the affinity of haemoglobin.
