NEET Zoology (general) MCQ Question
Which of the following statements about the transport of gases and their exchange in the human body are correct?
CO2 is more soluble in blood than O2, allowing for greater diffusion into the blood.
Only 3% of O2 is transported dissolved in plasma, while most is carried by hemoglobin.
The thickness of the diffusion membrane is crucial for efficient gas exchange.
70% of CO2 is transported by RBCs in the form of bicarbonate.
Correct Answer
Detailed Explanation
CO2 has a solubility that is 20-25 times higher than that of O2, facilitating its diffusion compared to O2, which is primarily transported by hemoglobin. Only about 3% of O2 is carried in a dissolved state. Option D incorrectly states the percentage of CO2 transported by RBCs; it is actually about 20-25%.
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