Fig. 4

Flow vs pressure for kidney (left) and heart (right) based on data from hemorrhaged dogs [11]. The dotted line indicates baseline state and the solid line indicates maximal vasodilation with nitroprusside. The initial flow vs pressure line for the kidney is steep and is only a little steeper with vasodilation. The heart starts with a much flatter flow vs pressure line but can increase fivefold in the pressure range of 70–80 mmHg. Note that the peak conductance of flow to the heart is only mildly higher than the baseline conductance to the kidney