Well, they ain't really meant for humans. It's more an modern zombie thing. I gotta artificial heart ta pump the preservative fluids 'round my body for example. Everything besides that is more or less optional.

[Zombina shrugs and laughs]

Pretty sure that an transplant heart wouldn't work for me. My preservative fluids are hella toxic ta humans, so who knows what would happen if I put an workin' heart in me?