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.
the main function of the plasma is: a) the plasma is the main transporter of nutrients to the cells b) carriers blood cells and platelets c) disolves waste materials d) disolves some carbon dioxide and transports it back to the lungs e) carries hormones f) carries blood clotting substances.