Nautilus,
For doctors to use fetal tissues for transplant or other experiments, they must keep the infant alive until the organs are harvested. There on the table is a wiggling baby gasping for air that is then cut apart for experimentation. There must be a better way. The same goes for when you are an organ donor. They don't let you die until they have harvested your organs, eyes, etc. It's likely they keep you under, but you are not dead. The organs would be spoiled if you were dead.
Sorry, I did not feel right leaving that up. You can look it up yourself.