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Blood plasma is to be distinguihed from '''serum''' which is plasma without fibrinogen which is separated following the clotting process.
Blood plasma is to be distinguihed from '''serum''' which is plasma without fibrinogen which is separated following the clotting process.
==Composition==
Plasma is mostly water (90%) but it also contains dissolved substances. These are circulated throughout the body and diffuse into tissues and cells where needed. Thes substances include proteins which are responsible for oncotic pressure within the blood vessels. The main proteins in plasma are albumin, globulins and clotting factorsparticularly fibrinogen.