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During the transportation of gases, about 20-25 percent of $CO_2$ is carried by Haemoglobin as carbamino-haemoglobin.
Reason: This binding is related to high pCO2 and low pO2 in tissues.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Detailed Solution
About 20-25% of $CO_2$ is indeed transported by haemoglobin as carbamino-haemoglobin (Assertion is true). This binding of $CO_2$ with haemoglobin is favoured by high $pCO_2$ and low $pO_2$, conditions found in the tissues (Reason is true and correctly explains the Assertion).