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Q.

The exchange of gases  between blood and tissues takes place by

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a

simple diffusion

b

active transport

c

faciliated diffusion

d

osmosis

answer is A.

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Detailed 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 mainly based on pressure/concentration gradient.

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