Blood delivers at the end of a capillary bed and picks up at the end of a capillary bed. this is because the pressures in and out are close to balancing. if hydrostatic pressure is mm hg at the arteriolar end and the colloidal osmotic pressure is mm hg. this means more pressure forcing fluid out of the capillary. at the venular end the hydrostatic pressure is mm hg and the colloidal osmotic pressure is still the same, so fluid returns to the capillary.

Blood delivers at the arterial end of a capillary bed and picks up at the venous end of a capillary bed. This is because the pressures in and out are close to balancing.

If hydrostatic pressure is 35 mm Hg at the arteriolar end and the colloidal osmotic pressure is 25 mm Hg. This means more pressure forcing fluid out of the capillary. At the venular end the hydrostatic pressure is 18 mm Hg and the colloidal osmotic pressure is still the same, so fluid returns to the capillary.