Composition Of Blood Blood Plasma

 Blood plasma:

Plasma ,the liquid portion of the blood, comprises an enormous number of ions, organic and inorganic molecules dissolved in water. water forms 92% of the plasma, while plasma proteins and other substances from 8% of the plasma.

Constituents of blood plasma      

constituent                     

1.Water : 

medium for carrying all other constituents

2.Electrolytes:  

sodium potassium calcium magnesium chloride etc.

Keep water in extracellular compartment; act as buffers; function in membrane excitability and blood clotting.

3.proteins:

(Albumins, globulins, fibrinogen)

Act as buffers; bind and transport other plasma constituents; clotting factors; antibodies; blood clotting.

4.gases

carbon dioxide , oxygen, nitrogen

5.Nutrient

(glucose, total amino acids, total lipids, cholesterol)

6.water products

(urea, creatin uric acid, bilirubin)

A large of the plasma proteins is classified into three broad group: albumins, globulins and fibrinogen. Albumins maintain osmotic pressure of the blood; globulins help in the body's defense mechanism and provide immunity to the body while fibrinogen helps in the clotting of blood. the albumins are by far the most abundant of these three groups and are synthesized by the liver.in addition to these; plasma contains various mineral electrolytes, nutrients, metabolic waste product and gases. plasma devoid of blood clotting factors and fibrinogen is called serum.

In ot words, serum is the residual fluids after clotting of the blood which has the same composition as plasma except the components which get eliminated after blood coagulation.

Despite variety of function, plasma proteins are not taken up by to be used as fuels or metabolic supplements as are most other plasma solutes, like glucose, fatty acids and oxygen. the trademark straw shade of plasma is generally due to bilirubin, a waste product of hemoglobin breakdown. in addition to transporting difference solute around the body, plasma disperses heat all through the body.