Every cell of the body has its own membrane potential, but only excitable cells - nerves and muscles - are capable to change it and generate an action potential.
A membrane potential is the difference between the electric potential in the intracellular and extracellular matrices of the cell .
The typical membrane potential range from –40 to –80 millivolts (mV).
The membrane potential for excitable cells when they are not excited is called the resting membrane potential,