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Gases cross from alveoli to blood mainly by:
ASimple diffusion
BActive transport
COsmotic flow
DBulk filtration
Answer & Solution
Correct answer: A. Simple diffusion
1. No energy is spent moving the gases.
2. They follow a pressure gradient.
3. That is simple diffusion.
_Source: NCERT Class 11 Biology, Chapter 17, Breathing and Exchange of Gases._
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