Wikipedia’s definition of transhumanism is this:
Transhumanism (sometimes abbreviated >H or H+) is an international intellectual and cultural movement supporting the use of new sciences and technologies to enhance human mental and physical abilities and aptitudes, and ameliorate what it regards as undesirable and unnecessary aspects of the human condition, such as stupidity, suffering, disease, ageing and involuntary death. Transhumanist thinkers study the possibilities and consequences of developing and using human enhancement techniques and other emerging technologies for these purposes. Possible dangers, as well as benefits, of powerful new technologies that might radically change the conditions of human life are also of concern to the transhumanist movement.
I consider myself a transhuman for the simple fact that if it wasn’t for science, I would not be alive at all. By using the above definition, the surgery and the revascularization (replacing damaged blood vessels) of my heart enables me to make that claim. Although in most cases a purist would say since I didn’t receive any artificial parts,(the surgeon used blood vessels from my own body) I couldn’t claim the transhuman label, the act of the surgery alone lets me do that because the technology of the surgery itself saved me. Without the ongoing research in bioscience, biotechnology and bioethics, there would be people dying from diseases and injuries like they did from the Middle Ages until after World War II.