Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: During the transportation of gases, about 20-25 percent of CO _2 is carried by Haemoglobin as carbamino-haemoglobin. Reason R: This binding is related to high pCO _2 and low pO _2 in tissues. In the light of the above statements, choose the correct answer from the options given below.
C. Both A and R are true and R is the correct explanation of A .
The correct answer is option (3) as nearly 20-25 precent of CO _2 is transported by RBCs whereas 70 percent of it is carried as bicarbonate. About 7 percent of CO _2 is carried in a dissolved state through plasma. The binding of CO _2 with haemoglobin is related to the partial pressure of CO _2 . pO _2 is a major factor which could affect this binding. When pCO _2 is high and pO _2 is low as in the tissues, more binding of CO _2 occurs. Percentage of a gas transported depends upon its partial pressure. If partial pressure decreases, the transportation of gases also decrease with haemoglobin. So, Reason is the correct explanation of Assertion.
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