Which Process Describes the Pushing of Water Across the Capillary

Question

Which process describes the pushing of water across the capillary (blood vessel)membrane?
A) Facilitated diffusion
B) Osmosis
C) Filtration
D) Pinocytosis

Accepted Answer

Filtration is the process by which water and other small molecules are forced across the membrane of a capillary and into the interstitial fluid. This occurs due to the hydrostatic pressure gradient created by the pumping action of the heart, which pushes blood through the capillary network.