In which of the following situations will arterial $\mathrm{PO}_{2}$ be closest to $100 \mathrm{~mm} \mathrm{Hg}$ ?

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[Chapter 3, VI D]. In a person with a left-to-right cardiac shunt, arterial blood from the left ventricle is mixed with venous blood in the right ventricle. Therefore, $\mathrm{PO}_{2}$ in pulmonary arterial blood is higher than normal, but systemic arterial blood would be expected to have a normal $\mathrm{PO}_{2}$ value or $100 \mathrm{~mm} \mathrm{Hg}$. During an asthmatic attack, $\mathrm{PO}_{2}$ is reduced because of increased resistance to airflow. At high altitude, arterial $\mathrm{PO}_{2}$ is reduced because the inspired air has reduced $\mathrm{Po}_{2}$. Persons with a right-to-left cardiac shunt have decreased arterial $\mathrm{PO}_{2}$ because blood is shunted from the right ventricle to the left ventricle without being oxygenated or "arterialized." In pulmonary fibrosis, the diffusion of $\mathrm{O}_{2}$ across the alveolar membrane is decreased.

In Which of the Following Situations Will Arterial PO2\mathrm{PO}_{2}PO2​ Be Closest To

In Which of the Following Situations Will Arterial $\mathrm{PO}_{2}$ Be Closest To