The primary force driving fluid transport between the capillaries and tissues is hydrostatic pressure.
which can be defined as the pressure of any fluid enclosed in a space. Blood hydrostatic pressure is the force exerted by the blood confined within blood vessels or heart chambers.
The rate of exchange, In either direction, Is determined by physical factors : hydrostatic pressureb , oncotic pressure , And the physical nature of the barrier separating the blood and the interstitium of the tissue (Ex:- The permeability of the vessel wall).
