True statement regarding pulmonary ventilation is -
PaO2 is maximum at the apex
V/Q is maximum at the base
Ventilation per unit lung volume is maximum at the apex
Blood circulation is minimum at the base
Apical alveoli have low ventilation and perfusion per unit volume of the lung, whereas the basal alveoli have high ventilation and perfusion.
Ventilation-perfusion ratio and the PaO2 is maximum at the apex. PCO2 is maximum at the base.