Pulmonary Blood Flow
The “Waterfall Effect” in pulmonary blood flow refers to a unique phenomenon that occurs in the lungs due to gravity, alveolar pressure, and vascular pressure gradients—especially in Zone 2 of the lung
Zone 2 – The Waterfall Zone
Location: Middle lung field (mid-lung)
Pulmonary arterial pressure > Alveolar pressure > Venous pressure
(Pₐ > Pₐlᵥ > Pᵥ)
Snapshot




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