Sample Questions — Exchange of gases
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MCQ
How does the thin interstitial space in respiratory membrane help?
✅ Correct Answer: C
Short diffusion path enhances exchange rate.
MCQ
How many layers are present in the human respiratory membrane?
✅ Correct Answer: A
The respiratory membrane comprises six very thin layers.
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MCQ
Why is a steep pressure gradient necessary for efficient gas exchange?
✅ Correct Answer: A
Greater gradient → faster movement of gas across membranes.
MCQ
Which factor contributes to the respiratory membrane being efficient in gaseous exchange?
✅ Correct Answer: C
The thin barrier and vast surface area support effective diffusion.
MCQ
COâ‚‚ diffuses out of the blood into alveoli because:
✅ Correct Answer: D
COâ‚‚ moves from capillary blood (45 mm Hg) to alveoli (40 mm Hg) due to the gradient.
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