Simplify the following text for a Grade 12 native English-speaking person.
Original: The relatively static membrane potential of quiescent cells is called the resting membrane potential ( or resting voltage ) , as opposed to the specific dynamic electrochemical phenomena called action potential and graded membrane potential .
Simplified: The resting potential of a cell is the membrane potential that would be maintained if there were no action potentials , synaptic potentials , or other active changes in the membrane potential .