Pulmonary vasodilator and vasoconstrictor actions of carbon dioxide

Abstract
1. Three preparations were used to study the actions of CO2 on the pulmonary vasculature: isolated rat and cat lungs perfused at a constant flow rate with homologous blood and a lobe of cat lung perfused at a constant flow rate in vivo. In all three changes in pulmonary artery pressure (PPa) reflected changes in pulmonary vascular resistance.

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