movement of fluid

• the hydrostatic pressure of the blood is not the only influence of fluid into ad out of the capillary- the tissue fluid has its own hydrostatic pressure, and the oncotic pressure of the solutes also has an influence.
• hydrostatic pressure of the blood tends to push fluid out into tissues
• the hydrostatic pressure of the tissue fluid tends to push fluid into the capillaries
• the oncotic pressure of the blood tends to pull water back into the blood
• the oncotic pressure of the tissue fluid pulls water into the tissue fluid.