Breathing and Exchange of GasesHard

Question

Gaseous exchange between blood and alveolar air across respiratory membrane occurs by :

Options

A.Osmosis
B.Diffusion
C.active transport
D.Phagocytosis

Solution

-Alveoli are the primary sites of exchange of gases. Exchange of gases also
occur between blood and tissues. O2 and CO2 are exchanged in these
sites by simple diffusion 

ncert 272 

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