Of several electricity concepts, the idea of  voltage  or  electrical potential  is probably the hardest to understand. Most of us are familiar with magnetic fields. Small magnets are surrounded with an invisible field which pulls upon iron, and which can attract or repel other magnets.
Plasma is a pale yellow sticky liquid. It makes up 55% of the blood s volume. The components of plasma are water 92%, dissolved protein 8%, glucose, amino acids, vitamins, minerals, urea, uric acid, CO2, hormones, antibodies.
Whole blood is composed of plasma (fluid portion of blood) and formed elements (blood cells and platelets). Plasma is the fluid portion of blood that contains proteins, ions, nutrients, hormones, antibodies, metabolites, enzymes, clotting factors, etc. Plasma is straw-colored and makes up approximately 55% of whole blood volume.