If the net filtration pressure is negative, water will diffuse into the capillary bed. it is the pressure value that promotes filtration.
Filtration pressure can be defined as the total pressure value promoting filtration, which in this case is a negative value.
Negative filtration pressure promotes the movement of a given fluid out of the capillary and into its surroundings.
Diffusion refers to the movement of molecules across a semi-permeable barrier.
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