So if you need the assistance of a mechanical ventilator are you no longer human since you can't breathe on your own? Why would taking your first breath suddenl

So if you need the assistance of a mechanical ventilator are you no longer human since you can't breathe on your own? Why would taking your first breath suddenly transform you from nonhuman to human? Further, is it ok for a hospital to stop attempting to save people once they flatline? After all, if we measure humanity according to this metric, then they ceased to he a human once they could no longer breathe.