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 Learning about how signals work could definitely help with understanding the whole output without input where a signal could start in an axon without getting a signal from some connected neuron. This could be due to the "battery" movements and with their movements they create a potential that occurs in the axon and then creates an action. This signal would then not be influenced by an input either from another neuron or from an outside stimulus. I'm still wondering if the output signal is random or not since the movements of ions or molecules are random. I know there are the channels and pumps that aid in keeping a gradient so maybe the signals are random because they can be influenced by the pumps. Can't wait to figure an explanation using what we know about signals. 

I do understand signals and how they function with sodium and potassium ions but I am a little confused on our explanation of potentials with batteries. I understand what a battery does but when talking about action potentials I became confused. Could someone maybe explain action potentials more clearly without using batteries?