What is the Glomerular Filtration Rate (GFR)? Discuss the physiological factors that can influence it.

Generally this question was well answered. Almost all answers gave the correct value for GFR
and the correct formula for Starling’s forces across the glomerular membrane.
Better answers discussed the physiological factors affecting each force (hydrostatic and
osmotic) across the membrane in a stepwise logical manner.
Some answers discussed the control of renal blood flow; this was not expected and therefore
was not rewarded.