Last Word on Point:Counterpoint: Gravity is/is not the major factor determining the distribution of blood flow in the human lung

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to the editor: P. D. Wagner and Hopkins ([4][1]), respectively, refer to gravitationally determined vertical gradients of alveolar size, blood volume, and lung density and their amplifying effect on vertical gradients of pulmonary blood flow. We pointed out at the beginning of this debate ([3][2])