These are mostly in the form of anions and are responsible for about 15% of the buffering capacity of the blood. They are involved in the transportation of thyroid, adrenocortical and gonadal hormones. The osmotic pressure of plasma proteins plays an important role in the exchange of fluid across capillaries (however plasma proteins only provide approximately 25 mm Hg of the osmotic pressure - a small proportion).
The plasma proteins have different electrical charges which permits electrophoretic separation.
The concentration of plasma protein is maintained in starvation.
Plasma proteins are mainly anions.
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