Oncotic Pressure - Colloidal Osmotic Pressure

The oncotic pressure in a fluid is the proportion of the osmotic pressure caused by the colloids of a solution, especially the proteins in the blood. In the blood, the oncotic pressure creates a suction effect into the tissue, which acts against the normal hydrostatic pressure. If the protein content in blood plasma is too low, water remains in the tissue. Oedema are created.

https://en.wikipedia.org/wiki/Oncotic_pressure _([1])

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