The science fiction blog io9 often delves into real science. They have a nice summary of the state of replacements for various organs. I was holding out for lungs, but since the scientists were dragging their feet I quit smoking instead. Timing is everything.

io9: Forget the Jetpack – Where Are My Replacement Organs?

“Knowing which organs you can live without is all well and good, but wouldn’t you rather have replacement organs? Tissue engineers already have some pretty good ones if you happen to lose your skin or severely damage your bones. And there are some other organs we’re cooking up for you too, as long as you can hold out for a few more years.”

In a previous post, there is an exploration of which organs you can live without. That is worth a look in case you ever need to make a split second decision on who to carry out of the jungle on your back.