NEET2024ZoologyBreathing and Exchange of GasesActual
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.
Options
- AA is true but R is false.
- BA is false but R is true.
- CBoth A and R are true and R is the correct explanation of A .
- DBoth A and R are true but R is NOT the correct explanation of A .
Correct answer
C. Both A and R are true and R is the correct explanation of A .
Step-by-step solution
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