Perfusion is uniformly distributed in the upper and lower parts of the lung but ventilation is higher in the bottom of the lung.

Ventilation is higher in the bottom of the lung and perfusion is also higher in the bottom of the lung.

Ventilation is uniformly distributed in the upper and lower parts of the lung but perfusion is higher in the bottom of the lung.

Ventilation is higher in the bottom of the lung but perfusion is higher in the upper part of the lung.