* An electrolyte is a substance that upon dissolving in a solution, ionizes, Meaning that some of its molecules split or become electrically charged atoms or ions.
* Each body fluid compartment contains a specific composition (or recipe) of electrolytes. Each compartment has its own recipe within its compartment which must maintain this recipe to function properly. When one electrolyte moves out of a cell another one moves in to maintain homeostasis. The compartments are separated by semi-permeable membranes.