A more practical option is using brain-dead humans for medical testing. This was discussed recently in the journal Science, using the term "physiologically main

A more practical option is using brain-dead humans for medical testing. This was discussed recently in the journal Science, using the term "physiologically maintained deceased". As they say, this "traverses complex ethical and moral terrain". (I've seen enough zombie movies to know how this ends up :-) https://www.science.org/doi/10.1126/science.adt3527 https://www.science.org/doi/10.1126/science.adt3527