Name the primary site of exchange of gases in our body ?

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Solution

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.

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Exchange of gases in the body takes place by which of the following mechanisms?

Column - I	Column - II
(a)	Pneumotaxic centre	(i)	Alveoli
(b)	$O_{2}$ dissociation curve	(ii)	Pons region of brain
(c)	Carbonic anhydrase	(iii)	Haemoglobin
(d)	Primary site of exchange of gases	(iv)	R.B.C.

In the respiratory system, the primary sites of gaseous exchange with blood vessels are:

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