transmitted to other parts of the plant when it's attacked or damaged. signals and plants can also be electrical when a particular stimulus reaches a certain threshold it can trigger what's known as an action potential and bang there's a reaction. from to be mentally it's comparable to what happens in human cells if there are certain types of electrical signals that so far have only been found in plants flunking in the ward and. scientists call these other signals system potentials they've observed how an impulse triggers changes and the voltage at the so membrane in simple terms the positive charge outside the cell and creases but instead of the membrane reacting with a sudden discharge when stimulated as happens with an action potential the increased voltage is passed on systemically from cell to cell from the leaf to leave.