reet
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what sympathetic system does on peritubular cappilaries...?
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| Geroo
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I think as sympathetic vasoconstric the efferent arteriol that will decrease hydrostatic pressure in the peritubbular cappilaries and increase reabsorbtion.
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| skyhigh
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if dec. sympathetic activity in the afferent arteriole, then decrease vasoconstrition, then, increase renal blood flow, then increase GFR, therefore decrease reabsorption in peritubular capillaries due to decreased oncotic pressure?
Edited by skyhigh on 02/02/06 - 04:31 PM
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| reet
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yes,,geroo,,, hydrostatic pressure decreasing,,, oncontic inceases CUZ proteind are more concentrated...
well.. reabsorption incraeses..
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| sturge_weber
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due to sympathetic , the vc and hence the peritubular capillary hydrostatic pr essure decreases, but capillary oncotic pressure incerases, and this favours reabsorption in the peritubular capillaries
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| Geroo
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I didn't get the oncotic pressure point,how sympathetic will increase peritubular capillary oncotic pressure?
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| skyhigh
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if vasoconstrict efferent arteriole, then upstream GFR and hydrostratic pressure increase right?
if vasoconstrict afferent arteriole then downstream, GFR and hydrostatic pressure increase correct?
Edited by skyhigh on 02/02/06 - 04:51 PM
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| sturge_weber
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wel, the oncotic pressure i slogic , because the hydrostatic pressure goes on decreasing, the oncotic pressure comparitively increases and this pulls the h2o back intoo the peritubular capillaries, and hence reabsorption
skyhigh, if u vc the afferent arteriole, then downstream gfr will decrease and the hydrostatic pr . will also decreases
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| skyhigh
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thanks
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