In comparison to the apex of the lung, the base of the lung has
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.
High pulmonary arterial pressure O2
High pulmonary arterial pressure CO2
High ventilation / perfusion ratio
Same ventilation / perfusion ratio