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Exchange of Gases

What is the P...

Question

What is the $P o_{2}$ and $P c o_{2}$ in the systemic arteries?

P o_{2}

40 mm Hg;

P c o_{2}

45 mm Hg

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P o_{2}

95 mm Hg;

P c o_{2}

40 mm Hg

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P o_{2}

40 mm Hg;

P c o_{2}

40 mm Hg

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P o_{2}

45 mm Hg;

P c o_{2}

40 mm Hg

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P o_{2}

104 mm Hg;

P c o_{2}

159 mm Hg

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Solution

The correct option is B $P o_{2}$ 95 mm Hg; $P c o_{2}$ 40 mm Hg
$P o_{2}$ in oxygenated blood (95 mm Hg) $> P o_{2}$ in body cells (40 mmHg) and $P c o_{2}$ in oxygenated blood is 40 mm Hg of $< P c o_{2}$ in body cells (45 mm Hg) during exchange of gases between blood and tissue. Therefore, in systematic arteries, $P o_{2}$ is 95 mm Hg and $P c o_{2}$ is 40 mm Hg.

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