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(B) In the given diagram of the alveolus and its associated capillary network:- $A$ represents the Alveolar cavity,which is the primary site for the e

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$A$: Alveolar cavity - the primary site of respiratory gas exchange.

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(B) In the given diagram of the alveolus and its associated capillary network:- $A$ 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 capillaries.- $B$ represents Red Blood Cells (RBCs),which are responsible for the transport of both $O_2$ and $CO_2$.- $C$ represents the arterial end of the capillary.- $D$ represents the capillary wall (endothelium),which along with the alveolar wall forms the respiratory membrane.Therefore,option $B$ correctly identifies $A$ as the alveolar cavity,which is the primary site of gas exchange.

The given figure shows a small part of the human lung where gas exchange occurs. Identify the part $A, B, C,$ or $D$ correctly with its function from the given options.

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