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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),$pCO_2 = 40\, mm\, Hg$.

Gas	Alveolar Air $(X/A)$	Atmospheric Air $(Y/B)$
$pO_{2}$	$X$	$Y$
$pCO_{2}$	$A$	$B$

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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