The process of gaseous exchange during respiration takes place between :

1
Epithelium of alveoli and Epithelium of blood capillary.
2
Epithelium of alveoli and Endothelium of blood capillary.
3
Endothelium of alveoli and Endothelium of blood capillary.
4
Endothelium of alveoli and Epithelium of blood capillary.

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