Page 180 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

B. Water reabsorption and excretion
GFR Plasma
= Water follows NaCl
100% water
H 2 O follows
NaCl, etc. 65%
290 mosm/kg H 2 O 25% subject to ADH control Water Reabsorption, Concentration of Urine II
Cortex Rest: H 2 O permeability

220
NaCl
ADH
Rest:
Outer medulla 600 35% Watertight High H 2 O
permeability
in antidiuresis
High osmolality 0.5% Maximum
antidiuresis
of interstitium:
Inner medulla 1200 H 2 O outflow 5% and Maximum Plate 7.10
FEH2O
10%
water diuresis
more
C. Urea in the kidney
Urea
100%
100%
Urea
concentration
(mmol/L)
5
Impermeable to urea
Passive
reabsorption

Circulates via countercurrent exchange in vasa recta
Rest:
50% 500
Recirculation of urea Urea permeability subject to ADH control

40%
FEurea 167

Despopoulos, Color Atlas of Physiology © 2003 Thieme
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