Figure 20-5 Autoregulation of the glomerular filtration rate (GFR) and renal blood flow (RBF), based on the original work of Shipley and Study.^[5] GFR and RBF remain constant between a renal arterial pressure of 80 and 180 mm Hg. (From Pitts RF: Physiology of the Kidney and Body Fluids. Chicago, Year Book, 1974.)