In the given diagram representing the partial pressure of gases during pulmonary 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)

  • A
    $95\, mm\, Hg, 40\, mm\, Hg$
  • B
    $45\, mm\, Hg, 40\, mm\, Hg$
  • C
    $40\, mm\, Hg, 40\, mm\, Hg$
  • D
    $40\, mm\, Hg, 45\, mm\, Hg$

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