The principle force that causes movement of fluid from the tissues into the capillaries is

Question

Quizplus · Accepted Answer

The osmotic pressure created by the plasma proteins (specifically albumin) is the main force that draws fluid from the tissues into the capillaries. This osmotic pressure is created because plasma proteins are too large to cross the capillary walls, so their concentration is higher in the capillaries than in the tissues, causing water to move from the tissues into the capillaries to try to equalize the concentration of solutes. Hydrostatic pressure in the arterial and venous blood can affect the movement of fluid, but they do not directly cause movement from the tissues into the capillaries. The pressure of lymph in the tissues around the capillaries also does not play a significant role in this process.

The Principle Force That Causes Movement of Fluid from the Tissues