Even in Healthy Young Subjects, Regional Differences in Pulmonary Ventilation $\dot { V }$

Even in healthy young subjects, regional differences in pulmonary ventilation and blood flow result in the PaO₂ being lower than the PAO₂. Why is this so?

A) Most blood flows through the apexes of the lung.
B) Most blood flows through areas with high $\dot { V }$ / $\dot { Q }$ .
C) Most blood flows through the bases of the lung.
D) Most ventilation goes to the apexes of the lung.

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