Four primary forces that determine whether the fluid will move in or out of the blood.
Starling Forces
capillary hydrostatic pressure= Pc
interstitial hydrostatic pressure= Pi
plasma colloid osmotic pressure=TTp
interstitial fluid osmotic pressure=TTif
1. Capillary pressure- force fluid outward
2. Interstitial pressure- force fluid inward through capillary membrane, inward if positive, outward if negative.
3. Plasma colloid osmotic pressure- cause osmosis of fluid inward
4. Interstitial fluid colloid osmotic pressure- causes osmosis of fluid outward.