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(B) In the human respiratory system,the partial pressure of carbon dioxide $(pCO_2)$ in deoxygenated blood that reaches the alveoli is approximately $

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$45\, mm\, Hg, 40\, mm\, Hg$

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(B) In the human respiratory system,the partial pressure of carbon dioxide $(pCO_2)$ in deoxygenated blood that reaches the alveoli is approximately $45\, mm\, Hg$.After the exchange of gases in the alveoli,the blood becomes oxygenated and the $pCO_2$ decreases to approximately $40\, mm\, Hg$.Therefore,at point $P$ (deoxygenated blood),$pCO_2 = 45\, mm\, Hg$ and at point $Q$ (oxygenated blood),$pCO_2 = 40\, mm\, Hg$.

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)	$(4)$ $45$

In the given diagram representing the partial pressure of gases in the systemic circulation,what are the partial pressures of $CO_2$ at $P$ and $Q$ respectively? (Assuming $P$ is deoxygenated blood entering the lungs and $Q$ is oxygenated blood leaving the lungs)

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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) $(4)$ $45$

Exchange of gases in man takes place at the level of

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