The glomerular capillary pressure and filtration rate both rise as the different arteriole radius decreases. Measurement of functional renal mass is the glomerular filtration rate. Reduced renal perfusion, obstructive renal disease, and primary renal disease can all cause reductions in GFR.
The forces that cause all capillary beds to filter plasma through the glomeruli are the same. Ultrafiltration happens when fluid is forced into Bowman's space from the lumen of glomerular capillaries by the Starling forces (hydrostatic and oncotic pressures).
The glomerular capillary's hydrostatic pressure (PGC) is set up to encourage fluid to pass from the capillary into Bowman's space. The glomerular ultrafiltrate contains extremely little protein due to the reflection coefficient for proteins across the glomerular capillary being almost 1.
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