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Old 03-17-2016
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Default Net driving force in capillaries


I don't understand how along the same capillary, the net driving force can change from positive (filtration) to negative (reabsorption) from one end to the other.
Because at some point while NDF decreases, it will reach zero and will be neither positive nor negative, so neither filtration nor reabsorption will occur at that specific point in time.
So from this situation, how can NDF continue to decrease and become negative, since filtration can't continue if NDF=0? What is the force that would maintain fluid leakage and make capillary hydrostatic pression continue to drop?

Thanks in advance for your help.
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