Every cell in human body is a charged ion. it always run short or surplus of electron. it keep balancing potential at all the times. In this process our whole biological function takes place. Our body too functions like antenna/oscillator. Its manifestation is our sense organs function. The life energies are responsible / behind. When the above said life energies find the body is incapable of retaining charges, it will quit, leaving the body merely a decomposing component.
it is merely my guess, and no solid evidences are available with me.