And so we have a decrease in blood flow because we don't have to worry about moving our arms or legs. We're not actually running, we're sitting down and we're watching television. So this is what the parasympathetic nervous system does. Now, in the same exact way that we discussed our pathway of the electrical signal, let's discuss the pathway in the parasympathetic case. So in the case of the sympathetic nervous system, our pre ganglionic neuron always begins in our spinal cord. But in this case, it can begin in a spinal cord or it also can begin in the brain.