Studying the inner workings of the undead is a primary area of focus for the Zombie Research Society. Broadly speaking, a great way to start thinking about this subject is to imagine that zombies are similar to old autos being used for a demolition derby.
Cars prepped for a derby are stripped down to their base essentials. The lights are removed, the seats are ripped out, the suspension is cut down to a minimum, the dashboard is stripped, and the radio is trashed. Anything that doesn’t directly assist in the accomplishment of the driver’s narrow objective is history. Just like a zombie occupying what was once a fully functioning human body, the demolition derby car is just a shell of its former self.
Furthermore, a derby car is not tasked with having a long and productive driving life. It’s only goal is to move about for a few brief seconds after the other cars on the track have died. Zombies are likewise not designed for longevity, but rather only need to live long enough to spread their infection to a new host.
Looking at the complex workings of a zombie through the lens of something as simple as a demolition derby sideshow helps to clarify the issues at hand. Everything from the zombie nervous system to it’s process of blood flow can and should be explained using this technique.