Final answer:
Zone 3 of pulmonary capillary perfusion is the part of the lung where both ventilation and perfusion are highest, allowing for efficient gas exchange.
Step-by-step explanation:
Zone 3 of pulmonary capillary perfusion refers to the part of the lung where both ventilation and perfusion are highest.
In this zone, the alveolar pressure is higher than the arterial pressure, allowing for efficient gas exchange.
This zone is found in the lower parts of the lung during normal tidal breathing.