NEET Zoology Gas Exchange MCQ Question
Which of the following statements about gas exchange in the human respiratory system is correct?
Carbon dioxide diffuses from the tissues to the blood due to a higher partial pressure in the tissues.
Oxygen diffuses from the alveoli to the blood at a higher rate than carbon dioxide due to its lower solubility.
The diffusion membrane is thicker than one millimetre, facilitating gas exchange.
Residual volume refers to the total volume of air that can be expelled from the lungs after a normal expiration.
Correct Answer
Detailed Explanation
Carbon dioxide indeed diffuses from the tissues to the blood due to its higher partial pressure in the tissues. Option B is incorrect as carbon dioxide is more soluble than oxygen, allowing more carbon dioxide to diffuse. Option C is incorrect because the diffusion membrane is much less than a millimetre thick. Option D misdefines residual volume, which is the air remaining in the lungs after forcible expiration.
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