Is it true we can live with only one kidney?
Is it true we can live with only one kidney?
user
I think you’d live without both kidneys, but they’re really important.  To be precise, there are three primary functions of the kidneys.  The first is to maintain the salt levels in your blood, which is why we always have a lot of water with us.  The second is to maintain the right levels of blood glucose, which is why we usually have some candy on us when we travel.  And the third is to remove toxic materials from the bloodstream, and these are often large protein molecules.  A single kidney can do all of these things, but it can’t do it all at once.  I don’t know how long you could live with just one kidney, but I can find out for you.
assistant
Don't fairly young people donate kidneys and live out their entire lives almost as normal?
user
They generally do.  This is because the human body has quite a bit of redundancy.  It is a bad idea to operate on one person with two kidneys, but otherwise you can just live with a part of yourself missing.
assistant
How come we can live with one kidney but not for example one lung?
user
I think you can live with half a lung, but they have to be replaced, and it’s hard to survive for a long time without both lungs.  Maybe you could live with one lung for a month or two, but you’d start feeling sick.  It’s also really hard to keep a lung healthy outside the body.
assistant
So why can you live a month or two only with one lung but for decades with one kidney?
user