Percentage of GFR to renal plasma flow:

Ans. (a) 20%Ref: Guyton's physiology 11th ed. / 316* GFR Is About 20 Per Cent of the Renal Plasma Flow.* In an average adult GFR is about 125 ml/min, or 180 L/ day.* Renal plasma flow is 650ml/min* The filtration fraction is calculated as follows: Filtration fraction = GFR/Renal plasma flow* Therefore125ml/min------------650ml/min= 0.2* The fraction of the renal plasma flow that is filtered (the filtration fraction) averages about 0.2; this means that about 20 per cent of the plasma flowing through the kidney is filtered through the glomerular capillaries.Also Know* The entire plasma volume is only about 3 liters, whereas the GFR is about 180 L/day, the entire plasma can be filtered and processed about 60 times each day.