It is the liquid portion of the blood which is about 55% of the volume of the blood. It is mainly water which is about 90% by weight of the plasma. A large no of organic and inorganic substances are dissolved in water. Plasma is composed of organic and inorganic constituents.
(a) Inorganic constituents:
0.9% of the plasma is made up of Na, Ca ions. Which are move abundant while K, mg P and Cu ions are in lesser amounts? The cheap salt in the plasma is the Nacl.
(b) Organic Constituents:
I. 7.5% of plasma is made up of different kinds of blood portions such as serum, albumin, serum globulin, fibrinogen and prothrombin.
II. Simple :
They constitute about 0.1% in this case glucose is move abundant.
III. Product of digestion & Metabolic Wastes:
2—3% of plasma is made up of products of digestion like amino acids, fatty acids etc and metabolic wastes such as Urea, Uric acid and CO2 etc.
IV. Fats:
Neutral fats, phospholipids, cholesterol and etc.
V. Antibodies:
These are the blood proteins which provide immunity against certain diseases.
VI. Hormones:
Some blood protein is hormones interval secretion, enzymes (lipase, amylase, phosphates
VII. Coloring matter:
The yellow color of the plasma is due to small amounts of biluribin, carotene and xanthophyllin.
Posted by: Wasim Javed