Compared with the base of the lung, in a person who is standing, the apex of the lung has

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[Chapter 4, VII C; Table 4.5]. In a person who is standing, both ventilation and perfusion are greater at the base of the lung than at the apex. However, because the regional differences for perfusion are greater than those for ventilation, the ventilation/ perfusion (V/Q) ratio is higher at the apex than at the base. The pulmonary capillary $\mathrm{PO}_{2}$ therefore is higher at the apex than at the base because the higher V/Q ratio makes gas exchange more efficient.

Compared with the Base of the Lung, in a Person PO2\mathrm{PO}_{2}PO2​

Compared with the Base of the Lung, in a Person $\mathrm{PO}_{2}$