Which of the following statements is $NOT$ correct?

  • A
    The partial pressure of $O_2$ in deoxygenated blood is $40 \, mm \, Hg$.
  • B
    The partial pressure of $O_2$ in oxygenated blood is $95 \, mm \, Hg$.
  • C
    The partial pressure of $O_2$ in alveolar air is $104 \, mm \, Hg$.
  • D
    The partial pressure of $CO_2$ in deoxygenated blood is $95 \, mm \, Hg$.

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What is the direction of the concentration gradient for $CO_2$ and $O_2$ during gas exchange?
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The $pCO_2$ of inspired air is . . . . . . $mm \ Hg$ during external respiration.

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

Which of the following is true regarding $CO_2$ concentration?

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