Renal Blood Flow and Glomerular Filtration Rate

Question 1

What proportion of cardiac output to kidneys receive? Why?

Answer 1

kidneys receive 1/4th of cardiac output
NEEDED TO SUPPORT FILTRATION (20% f plasma is filtered)
[CO is not needed for metabolism]

Question 2

How many liters of filtrate are formed per day?

Answer 2

180 liters

Question 3

Equation for Filtration Fraction

Answer 3

FF=GFR/RPF
GFR= Glomerula Filtration Rate
RPF=Renal Plasma Flow= (1-HCT)RBF

Question 4

What do sympathetic nerves do to renal blood flow?

Answer 4

vasoconstrict via alpha1 receptors->decrease RBF & GFR