Page 222 - Color_Atlas_of_Physiology_5th_Ed._-_A._Despopoulos_2003

A. Exchange of fluids via capillaries and venules
30 4.0
∆P (hydrostatic mmHg Reabsorption kPa
pressure difference) 3.5
25
∆π (oncotic 3.0
pressure difference) Filtration
20 2.5
Path of exchange
15 2.0
Filtration Exchange Processes
= Reabsorption + lymph drainage
K f (filtration coefficient)
P eff (effective filtration = k (water permeability)
pressure) Filtration · A (exchange area)
= ∆P – ∆π Endothelial
Arteriole Venole
Reabsorption
Q f (Filtration/reabsorption rate) Plate 8.12
Interstitium ca. 90%
= P eff · K f
ca. 10%
Lymph
B. Causes of edema

Arteriole Venule
1
2
Precapillary Capillary Venous pressure rises
vasodilatation pressure rises
mmHg kPa
30 4.0
3
3.5
Decrease in plasma proteins 25
3.0
mmHg kPa 20
30 4.0 2.5
3.5
25 Edema
3.0
20
Filtration
Edema > Reabsorption+lymph drainage
4
Reduced lymph drainage Edema
(e.g., in ankles) 209

Despopoulos, Color Atlas of Physiology © 2003 Thieme
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