Changes

==Composition==

==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.

Plasma is mostly water (90%) but it also contains the following substances:

*Hormones and enzymes.   

 

These substances are circulated throughout the body by plasma and diffuse into tissues and cells where needed.  

 

Plasma  proteins are large molecules of which there are four main types, albumin, Globulin, fibrinogen and prothrombin. Albumin maintains oncotic pressure within the blood vessels and hence blood volume and blood pressure. Globulins which are produced by lymphocytes act in immune reactions and fibrinogen and prothrombin are required in order for clotting to occur.