Final answer:
Fluid is filtered through capillaries via capillary exchange, which involves filtration and reabsorption. Filtration occurs near the arterial end of the capillary due to a higher capillary hydrostatic pressure (CHP) compared to blood colloidal osmotic pressure (BCOP), pushing fluid out of the capillary.
Step-by-step explanation:
Fluid is filtered through capillaries by a process called capillary exchange. This process involves two primary mechanisms: filtration and reabsorption.
Filtration occurs near the arterial end of the capillary, where capillary hydrostatic pressure (CHP) is greater than blood colloidal osmotic pressure (BCOP). This pressure gradient pushes fluid out of the capillary and into the interstitial space.
Reabsorption, on the other hand, occurs near the venous end of the capillary, where BCOP is greater than CHP. This pressure gradient pulls fluid back into the capillary.