Approximated Values
Following are approximated values for the variables in the equation for both arterioles and venules:
| Location | Pc (mmHg) | Pi (mmHg) | σπc (mmHg) | σπi (mmHg) |
|---|---|---|---|---|
| arteriolar end of capillary | +35 | −2 | +28 | +0.1 |
| venular end of capillary | +15 | −2 | +28 | +3 |
Some albumin escapes from the capillaries and enters the interstitial fluid where it would produce a flow of water equivalent to that produced by a hydrostatic pressure of +3 mmHg. Thus, the difference in protein concentration would produce a flow of fluid into the vessel at the venous end equivalent to 28 − 3 = 25 mmHg of hydrostatic pressure. The total oncotic pressure present at the venous end could be considered as +25 mmHg.
In the beginning (arteriolar end) of a capillary, there is a net driving force outwards from the capillary of +9 mmHg. In the end (venular end), on the other hand, there is a net driving force of −8 mmHg.
Assumed that the net driving force declines linearly, then there is a mean net driving force outwards from the capillary as a whole, which also results in that more fluid exits a capillary than re-enters it. The lymphatic system drains this excess.
Read more about this topic: Starling Equation, The Equation
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