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A: Anatomic dead space arising from non-exchange airways is constant. B: Alveolar dead space depends on perfusion of the lung. When the right pulmonary is ligated, alveolar dead space in that lung increases, but alveolar dead space in the left lung drops to compensate. (Note that this figure has been redrawn to correspond to human lung West zones; in quadruped animal models the lung zones are rotated 90°).
