Hydrostatic pressure affects water movement between the interstitial fluid and the plasma.

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Hydrostatic pressure is one of the driving forces that determine the movement of water across capillary walls between the interstitial fluid and the plasma. Specifically, hydrostatic pressure (also known as blood pressure) in the capillaries pushes water and small solutes out of the capillaries and into the interstitial space, while hydrostatic pressure in the interstitial space opposes this movement and tends to push water back into the capillaries. Other factors that affect water movement between these compartments include osmotic pressure, which is determined by differences in solute concentration between the compartments, and permeability of capillary walls to various solutes.

Hydrostatic Pressure Affects Water Movement Between the Interstitial Fluid and the Plasma