babydoc4usmle
Forum Guru
Topics: 18
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A
one of 2 forces is in favor of filtration
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| Ancylostoma
Forum Guru
Topics: 42
Posts: 642
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C hydraulic pressure - I'm pretty sure this means hydrostatic pressure. the main factor effecting gfr is hydrostatic pressure, a minor factor would be renal blood flow or plasma flow.
Babydoc, an increase in oncotic pressure would oppose filtration. This occurs in exercising in a warm environment. the loss of fluid would increase the capilary oncotic pressure and thus decrease GFR. If you are still unclear, type gfr in the post search under my sn. I made up a question with a women who has a low gfr and just came from the gym.
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| Luckyall
Forum Guru
Topics: 11
Posts: 593
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should be C, agree
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| babydoc4usmle
Forum Guru
Topics: 18
Posts: 634
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i misread, thought about oncotic pressure in capsule, no A is out
but C is not true either - increasing pressure in BC is not promoting filtration, it opposes it (remember ureter obstruction???)
so the only one left is E......
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| Ancylostoma
Forum Guru
Topics: 42
Posts: 642
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lol right looks like I misread too, I was sure it said glomerular capillary, but it says bowmans capsule. So the answer is D, increase in renal plasma flow
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| unique1
InGodITrust
Topics: 19
Posts: 1,405
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D an increase in the renal blood flow.
Choice A , is not correct as increase in capillary oncotic pressure will reduce filteration decrease the GFR.
Choice B , is not correct as vasoconstriction of afferent arteriole will decrease the blood flow and GFR.
Choice C , is not correct as increase in hydraulic (hydrostatic) pressure in the bowman's capsule will oppose filteration and decrease GFR.
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| peggy
Forum Newbie
Topics: 0
Posts: 20
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Answer D is for sure right.
The explanation:
Normal situation: as plasma is filtred in the glomerulus the protein concentration increases along the way, so at the end of capilary network (termianl capilary)there is the highest protein concentration and this decreases net filtration pressure (higher oncotic p).
Higher blood flow: the blood passes through glomerulus faster, plasma has less time to filtrate, thus at the end the relative protein concentration increase in the terminal capilary is smaller (not so high oncotic pressure). And this means higher filtration pressure here. Termianl capilary will have greater filtration pressure, thus total GF will increase!
Hope ths helps!
GL!
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| drfax
Forum Elite
Topics: 21
Posts: 233
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D.
check out this
Attached Files:
showimage.jpg (128 KB, 29 downloads)
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| drfax
Forum Elite
Topics: 21
Posts: 233
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this is the explanation if u like.
good luck
Attached Files:
RENAL BLOOD FLOW.doc (36 KB, 17 downloads)
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| NeimanPicksMOM
Topics: 5
Posts: 24
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thank god its D, i thought I was in the Twilight Zone when i saw the answers people posted.
This is a very simple concept!
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| nandrolone
Forum Junior
Topics: 8
Posts: 51
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answer id D
The explanations given here are fine......Plus the Kaplan substantiates it
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| sany
Forum Senior
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Posts: 120
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I go for D with out thinking twice for obvious reasons.
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