Whereas diffusion is more important for solute exchange between plasma and interstitial fluid, bulk flow is more important for regulation of the relative volumes of blood and interstitial fluid.

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Diffusion is a passive process that allows for solute exchange through the plasma membranes and is more important for solute exchange between plasma and interstitial fluid. On the other hand, bulk flow is a passive process that involves movement of fluid and solutes together in response to pressure gradients and is more important for regulation of the relative volumes of blood and interstitial fluid.

Whereas Diffusion Is More Important for Solute Exchange Between Plasma