FIGURE 8-6 Model of capillary fluid exchange. Assuming that Pi = 1, nc = 25, ni = 6 mm Hg, and a = 1, and assuming that capillary hydrostatic pressure (Pc) at the beginning and end of the capillary are 30 mm Hg and 15 mm Hg, respectively, the net driving force [NDF = (Pc - Pi) - (nC - n)] is positive along most of the length of the capillary, which causes filtration (Filtr) to occur. Near the venular end of the capillary, the NDF is less than zero and reabsorption (Reab) occurs.

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