Sublime

One kind of receptor that GABA attaches to, for example, only lets chloride ions into the cell. Chloride ions have a negative charge and letting more in makes it harder for the neuron to reach the electrical threshold it needs to fire. The receptors to which excitatory neurotransmitters attach let in positively charged ions, like sodium, which

So you can think of the nervous system as the electrical wiring that runs the machine of your body.