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We don't want to upset any prissy personalities
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I resent that! *fume*
Anyway, zombies don't need circulatory or digestive systems. All their minimal metabolic processes are carried out by the infecting agent, a type of bacteria which uses the undead to spread from one host to another. The zombie's tissues are infused with the bacteria, which ferries the needed brain chemicals from the mouth, throat, stomach, wherever to the zombie's brain.
Locomotion is likewise carried out through chemical stimulation of the various muscle groups. It's a cumbersome process accounting for the zombie's slow and staggering movements. The zombie occasionally needs to devour bits of blood and tissue to feed the bacteria, accounting for the zombie's habit of non-brain flesh nomming.