Fill in the blanks with approriate words.
Alveolar $P O_{2}$ is .......... than the venous $P O_{2}$ while arterial $P O_{2}$ is .......... than the alveolar $P O_{2}$ .

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Solution

Alveolar PO2 is higher than the venous PO2 while arterial PO2 is lower than the alveolar PO2. It is this difference in partial pressures of O2 that causes diffusion of O2.

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