Ventilation- perfusion ratio通气/血流比值 a Alveolar ventilation(=4.2 L a Pulmonary blood flow(Q)=5L a V/Q=0.84(optimal ratio of air supply and blood supplyVentilation-perfusion ratio 通气/血流比值 ◼ Alveolar ventilation (V) = 4.2 L ◼ Pulmonary blood flow (Q) = 5 L ◼ V/Q = 0.84 (optimal ratio of air supply and blood supply)