We’ve already touched on several reasons why zombie blood likely flows through the undead body, but most compelling might be the brain’s constant hunger for blood to continue working properly. Even if zombies function at a substantially reduced capacity to their human counterparts, the amount of blood used on a constant basis is staggering.
“20% of the blood that comes out of the heart goes into the brain. So with every heartbeat there is so much blood that goes into the brain that it actually pulses.”
To put this in perspective, an adult male dedicates up to 500% more blood to his brain than it should require by weight.
Until a credible scientific theory is developed to explain how the zombie brain might survive without some level of blood hydration, the evidence suggests that blood continues to be a key player in the undead system.
Watch a living human brain pulsing with blood at the 9:31 minute mark of Voytek’s talk.