Sample calculations using the Starling equation

a. Example 1: At the arteriolar end of a capillary, Pc is 30 mm Hg, ttc is 28 mm Hg, Pi is 0 mm Hg, and ttj is 4 mm Hg. Will filtration or absorption occur?

Net pressure = (30 - 0) - (28 - 4) mm Hg = +6 mm Hg

Because the net pressure is positive, filtration will occur.

b. Example 2: At the venous end of the same capillary, Pc has decreased to 16 mm Hg, ttc remains at 28 mm Hg, Pj is 0 mm Hg, and irt is 4 mm Hg. Will filtration or absorption occur?

Net pressure = (16 - 0) - (28 - 4) mm Hg = -8 mm Hg

Thus, because the net pressure is negative, absorption will occur.

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