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Old 05-19-2015
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Default renal doubt

i have a doubt in kaplan physio
it says that when sympathtic activity is increased filtration fraction is also increased....but due to vasoconstriction there must be a decrease in GFR and also RBF so shudnt FF either remain the same or decrease because of decrease in renal flow?
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Old 05-19-2015
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I might be wrong BUT,

If you think like this,

Beta Receptors(sympathetic system) stimulates renin secretion ---> production of angiotensin II,

This Angiotensin II will constrict the efferent arteriole resulting into an increase in pressure of the glomerular filtration bed, that is increase GFR with same blood flow(slight less blood flow) filtration fraction will to go up.

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