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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.

Column-$I$	Column-$II$ (Amount of $CO_2$ in $mm \ Hg$)
$(a)$ Alveoli	$(1)$ $40$
$(b)$ Tissue	$(2)$ $45$
$(c)$ Blood without $O_2$ (Deoxygenated)	$(3)$ $40$
$(d)$ Blood with $O_2$ (Oxygenated)	$(4)$ $45$

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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Arrange the appropriate pair.
Column-$I$ Column-$II$ (Amount of $CO_2$ in $mm \ Hg$)
$(a)$ Alveoli $(1)$ $40$
$(b)$ Tissue $(2)$ $45$
$(c)$ Blood without $O_2$ (Deoxygenated) $(3)$ $40$
$(d)$ Blood with $O_2$ (Oxygenated) $(4)$ $45$

What is the value of $pO_2$ in alveoli and tissues respectively?

During oxygen transport,the oxyhaemoglobin at the tissue level liberates oxygen to the cells because in tissue:

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