Final answer:
Approximately 15% of capillary filtrate is returned to the bloodstream through the lymphatic system after being picked up by lymphatic vessels from the interstitial fluid.
Step-by-step explanation:
About 15% of capillary filtrate is returned to the blood by the way of the lymphatic system. In the body's circulatory process, capillaries release about 20 liters of plasma into the interstitial space each day, which is referred to as interstitial fluid. Of this, 17 liters are directly reabsorbed by the capillaries and 3 liters, which constitute the remaining 15%, are picked up by the lymphatic vessels and eventually returned to the bloodstream.