drk1980
Forum Guru
Topics: 147
Posts: 1,038
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efferent arteriolar dilation shd:
Inc RPF
Dec GFP
Dec GFR
Dec FF since FF= GFR/RPF
plz let me know if tht ws correct.
thanks for the Q. GL
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| cyra
Moderator
Topics: 29
Posts: 844
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Yes...this is what i figured as well...
The source of confusion for me was an answer to the end of chapter questions in kaplan physio notes...i shall post the question and the answer choice which created the ambiguity...let me know what you think...
Q.If vascular resistance in the renal afferent arteriole decreases more than does resistance in the efferent arteriole,whcih one of the resulting changes is INCORRECT?
- FF is decreased
- Pressure facouring reabs in the peritubular cap is decreased
- Both RPF and GFR are increased
- Hydrostatic P favouring glomerular filtration is decreased
- ECF vol will contract
Now without getting into the details and expalination of the correct answer to this Q...the bold bit in the expl to choice 3 doesn't make sense...
3.Both RPF and GFR are increased.This is true since the dominant vasodilation is in the afferent arteriole.Vasodilation of the efferent vessel does decrease the net filtration pressure but to a minor extent.If the dominant change had been in the efferent vessel the GFR would have increased and RPF decreased.
What do you think?
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| Doc2378
Forum Guru
Topics: 46
Posts: 688
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 ...this doesn't make sense...am sure there is a mistake here...
___________________
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| cyra
Moderator
Topics: 29
Posts: 844
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Yes...this has to be a mistake...just wanted to make sure...thanks guys!
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