keepgoing
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for a person to remain in Na+ balance, the amount of Na+ excreted in the urine must be exactly equal to daily Na+ intake.
When a person eats a high Na+ diet, because Na+ is primarily distributed in the ECF, there is an increase in ECF volume and EABV. The increase in EABV is detected, and the kidneys orchestrate an increase in Na+ excretion that attempts to return ECF volume and EABV to normal.
ref-costanzo
hope it helps you.
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| alirizvi
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lol..
What about when u take in More salt. Shouldnt there be less stimulus for Macla densa / JG cells and dec Ang II. And dec constriction on Eff and dec hydrostatic pressure and dec GFR. And if GFR is dec shouldnt Na+ Filtration Fraction dec also.. then how can the body maintain this Na+ excretion when we take more salt in 
Actually as i was typing this i realized that osmolarity has more of an affect on Vasopressin than RAAS but it sounded so nice and confusing before ^_^ ..
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| drdokhtar
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um ok ... so basically whatever we take in of most substances...we excrete the same amount. Is that safe to say?
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| maoudoody
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men the blood flows in kidney again and again
so even if the kidney will dump 33% in pct and 5 % in dct it will do so for several times till reaching 300osmolality
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