Page 170 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

D. Reabsorption, secretion and fractional excretion
1 2 3 4 5 6
II
Fractional reabsorption (FR) [%] at the Nephron
Concentration in plasma water (P) % in proximal tubule (TF/P) % in loop of Henle (TF/P) Fractional excretion (FE) P= Plasma

concentration
TF= Concentration
in tubular urine
Substance [mmol/L] Total % [% of filtered amount] Effects: raises FE Transport Processes

lowers FE

H 2 O --- 65% 10% 93%–99.5% 0.5%–7% ADH:
153 65% 25% 95%–99.5% 0.5%–5% Aldosterone:
Na + (1.0) (0.4) ADH: Plate 7.5
ANP:
K + 4,6 65% 10%–20% Secretion 2%–150% Aldosterone:
(1.0) possible
Ca 2+ Free: 1.6 60% 30% 95%–99% 1%–5% PTH:
(1.1) Acidosis:
Mg 2+ Free: 0.6 15% ca. 70% 80%–95% 5%–20% P rise:
(2.5)
Cl – 112 55% ca. 20% 95%–99.5% 0.5%–5% ---
(1.3)
–
HCO 3 24 93% 98%–99% 1%–2% Alkalosis:
(0.2)
2.2 65% 15% 80%–97% 3%–20% P rise:
(1.0) PTH:
Phosphate
Ca falls:
2+
Acidosis:
D-Glucose 5 96% 4% ≈100% ≈0% Sharp P rise:
(0.1)
Urea 5 50% Secretion ca. 60% ca. 40% Diuresis:
(1.4)
Creatinine 0.1 0% 0% 0% 100% ---
(2.9)

PAH (I.V.) C test Secretion Secretion Secretion ≈500% Sharp P rise: 157

Despopoulos, Color Atlas of Physiology © 2003 Thieme
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