The most important force causing net water flow across capillary walls is .
A)intracellular hydrostatic pressure
B)hydrostatic pressure of interstitial fluid
C)hydrostatic pressure of capillary blood
D)osmotic pressure of plasma proteins

Question

Quizplus · Accepted Answer

The hydrostatic pressure of capillary blood is the most important force causing net water flow across capillary walls. This pressure is generated by the pumping action of the heart and the resistance of the small arterioles that lead to the capillaries. It pushes water and solutes out of the capillary into the interstitial space. Other forces, such as the osmotic pressure of plasma proteins, also play a role in regulating water movement, but they are not the primary force.

The Most Important Force Causing Net Water Flow Across Capillary