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(B) In the given figure,$A$ represents the alveolar cavity,which is the primary site for the exchange of respiratory gases ($O_2$ and $CO_2$) between

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$A$: Alveolar cavity - main site of exchange of respiratory gases

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(B) In the given figure,$A$ represents the alveolar cavity,which is the primary site for the exchange of respiratory gases ($O_2$ and $CO_2$) between the air in the alveoli and the blood in the pulmonary capillaries.$B$ represents red blood cells (erythrocytes),which are primarily involved in the transport of $O_2$ and $CO_2$.$C$ represents the arterial end of the capillary.$D$ represents the wall of the capillary.Therefore,the correct identification is $A$: Alveolar cavity - main site of exchange of respiratory gases.

The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part ($A, B, C$ or $D$) correctly identified along with its function.

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