Vivisection has a VERY negative connotation, to me, at least. I remember when animal rights protests were mostly about stopping vivisection. They used to do this with frogs in high school biology classes…they’d pith them, which is basically giving them a kind of lobotomy so that they still breathed and the heart still beat, but they couldn’t move. Then they’d dissect them like that so the students could watch the heart beat and the lungs breathe.
They had stopped this practice before I got to biology in high school, thank TDOYC!