Answer :
Filtration is the process in which hydro-static pressure forces water and small solutes such as salts,through narrow clefts between capillary cells.
Explanation:
The process by which exchange of water and solute takes place between the interstitial fluid and blood through the walls of capillaries is called capillary filtration.
The hydro-static pressure applied on the walls of capillary by blood forces the water and solute to move out of the small pores in the capillary wall.