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.
Platelet, double red cell, or plasma donations. Blood contains several components, including red blood cells, platelets, white blood cells and plasma. During platelet or plasma donation, your blood is collected and then separated into its components by a machine; the machine keeps the platelets or plasma and returns the rest to you.