ABSTRACT
The net filtration force out of the capillary into the interstitial fluid is BHP+IFOP and the net absorption force into the capillary is IFHP+BOP. Normal transcapillary exchange is shown in Figure 19.9. In this figure it can be seen that at the arterial end the pressures combine to produce a net outward filtration force from the capillary of approximately +10 mmHg, followed by a net inward absorption force of - 10 mmHg at the venous end. This balance of forces can be upset by changes in plasma oncotic pressure, arteriolar constriction, venular constriction, arterial blood pressure, venous blood pressure, and the integrity of the capillary wall. These effects are summarized graphically in Figure 19.10.
