This article analyzes the relationship between the ethics of the living as an in vivo organism, its in vitro biological studies, and the bodily future of the human being. It aims to show the inseparability between the pragmatic procedures implemented in the study of its micro-biochemical structures and its repercussions on the integrity of the human species. We take as examples emerging diseases and the crossing of species barriers, as well as the issue of medical experimentation. We thus pose the consequences of these different approaches in the theoretical framework of relativist and postmodern ethics.