the structure of an animal's body and its external structures are labeled in red, blue, and white

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Starling Forces

Starling forces consist of hydrostatic pressure and osmotic (oncotic) pressure. Hydrostatic pressure is the pressure of the fluid within the blood vessel, while osmotic pressure is the “sucking” pressure drawing water toward solutes. Oncotic pressure is osmotic pressure due to proteins. Hydrostatic pressure forces fluid out at the arteriolar end of a capillary bed; oncotic pressure draws it back in at the venule end. Prevents edema (buildup of interstitial fluid from hydrostatic pressure).

Osmotic Pressure