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Solution


Q.

In humans, exchange of gases occurs
 a) By diffusion    
 b) Between blood and tissue
 c) Between alveoli and pulmonary blood capillary    
 d) All of the above
1 A
2 B
3 C
4 D

Ans.

(d) All of these.
Alveoli are the primary site of exchange of gases. Exchange of gases also occur between the blood and tissue. O_2 and CO_2 are exchanged in these sites by simple diffusion, mainly based on pressure concentration gradient
Pressure/Concentration gradient, solubility of gases as well as the thickness of the membranes involved in diffusion are some important factors that affects the rate of diffusion