Neuron WorksheetNeurons send messages in a chemical form and then become electric signals; when they are charged electrically, they are known as ions. Resting potential in a neuron means the neurons are not working or not firing the electrons or neurotransmitters. When a neuron is resting, it is mostly negative inside and more positive outside. When they are at rest, potassium ions or transmitters can cross through membranes easily but negatively charged protein ions or molecules cannot. An action potential for neuron is when the neurons are active and are sending the information to another cell or communicating with another cell through axons from one neuron to another neuron. This is also called a spike or an impulse. Most of the time the size of a spike or impulse is the same. Sometimes, it works accurately and sometimes it fails in the process.