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Characteristic impedance (ZC) as a function of mean pulmonary artery pressure (mean PAP) for control (CTL, squares) and hypoxic (HPH, triangles) mouse lungs in a normal tone state and treated with serotonin (5HT, white) or sodium nitroprusside (SNP, gray). Note that serotonin shifts the ZC-PAP relationship upward. (Striped triangles represent where serotonin did not generate the same effect).
