Watch the Harvard Extension School video at youtube.com/watch?v=oa6rvUJlg7o (Action Potential in the Neuron.) 1. How does electrical flow cause information flow along neurons? In what way, if any, is the human nervous system a "digital" system as opposed to an "analog" system? 2. Describe two specific electrical potential levels i.e., voltages that are important in human nerve activity, and explain their significance. Do you feel these are high voltages? Why?