Breathing and Exchange of GasesMedium
Question
Exchange of gases between blood and alveolar air in lungs occurs by :
Options
A.Active transport
B.Simple diffusion
C.Osmosis
D.All of these
Solution
Alveoli are the primary sites of exchange of gases. Exchange of gases alsooccur between blood and tissues. O2 and CO2 are exchanged in thesesites by simple diffusion mainly based on pressure/concentrationgradientsee ncert 272
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