The human body contains a large amount of blood, lymph fluid and cerebrospinal fluid is mainly composed of water, every cell in the human body is filled with water, which dissolves all kinds of electrolytes, all of which constitute the human body fluids. Body fluids exist in the human body, accounting for a very large portion, is 70% of the body weight.
Electrolytes dissolved in human body fluids, the formation of charged ions, these ions in the role of the external electric field, in the body fluids for directional movement, the formation of electric current, the human body has the same electrical conductivity, became a conductor.