Tissue fluid exachange at capillaries (example numbers)

• Hydrostatic pressure of blood;

  Arteriole End

  4.3 kPa - This pressure pushed fluid out through capillary walls into the tissues

  Venous End

  1.6 kPa - Lost fluid, so lowers pressure
• Hydrostatic pressure of tissue fluid;

  Arteriole End

  1.1 kPa - This pressure tends to push fluid into the capillaries

  Venous End

  1.1 kPa
• Oncotic pressure of blood;

  Arteriole End

  -3.3 kPa - This tends to pull water back into the blood

  Venule End

  -3.8 kPa
• Oncotic pressure of tissue fluid;

  Arteriole End

  -1.3 kPa - This tends to pull water into the tissue fluid

  Venous End

  -1.3 kPa
• Net result of force;

  Arteriole End

  1.20 kPa - Fluid moves out of capillary

  Venous End

  -1.0 kPa - Fluid moves into capillary