1)Ownership is a bit of a moot point at that point, because you are already dead. 2)Your wishes will still be respected assuming you took the relevant steps be

1)Ownership is a bit of a moot point at that point, because you are already dead. 2)Your wishes will still be respected assuming you took the relevant steps before you died. The difference now is that the default assumption is that you aren't selfish enough to deny life and quality of life to those who are left behind. It's not likely you need your heart, lungs, liver, corneas etc. You are, at this stage, already dead. 3)If one is sufficiently selfish to doom those in need of a transplant, there's a register for that. 4)Your body probably isn't going to just stay wherever you died anyway. The responsibility for dealing with it is transferred to others regardless, what with you being dead and all.