Answer:
The primary site for
the exchange of gases in our body is alveoli. There are 300 millions of alveoli
collectively in both the lungs. These alveoli have very thin wall consisting of
squamous epithelium. With extensive network of blood capillaries.
The presence of
blood capillaries in the alveoli, result in easy exchange of gases. Each alveolus
is also called as miniature lung.
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