system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can we have heart-lung bypass and kidney dialysis but not liver dialysis? What makes creating liver dialysis so difficult?

Is it the functional complexity of the organ?
gpt
ELI5 version: The kidney is a filter. The liver is a factory. We can build pretty good filters, and add stuff back in if we need to. Replicating every single synthetic and metabolic function of the liver would take a machine that can perform thousands of different reactions at controlled rates.