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

Question

Quizplus · Accepted Answer

The hydrostatic pressure of capillary blood is the most important force causing net outward water flow across capillary walls. This pressure is generated by the pumping action of the heart and the resistance of the blood vessels. This force pushes water out of the capillaries and into the interstitial fluid. The other pressures listed (intracellular hydrostatic pressure, hydrostatic pressure of interstitial fluid, and osmotic pressure of plasma proteins) may play a role in fluid movement, but they are not the primary force driving net outward flow across capillary walls.

The Most Important Force Causing Net Outward Water Flow Across