+601 Every seven years, every cell in our body has died and been replaced. By seven years, we have completely disappeared. This is kind of an eerie thought, amirite?

by Anonymous 14 years ago

Not every cell. We never replace our neurons.

by Anonymous 14 years ago

We don't regenerate brain cells or muscle cells. This is why you don't get a new brain every 7 years

by Anonymous 14 years ago

@1151013 (Shortstopmwd): I wish some people did.d

by Anonymous 14 years ago

also, the new cells are exact replicas of the ones they replace.

by Anonymous 14 years ago

1. If they're exact replicas, how do we age? 2. I'll just give you an exact replica of the person you're closest to. Sure, they won't actually have been the being that you've created all the memories or shared all those awesome moments with, but they LOOK the same, so it's just as good, yeah?

by Anonymous 14 years ago

i just meant that technically, you wouldn't be gone, because your nucleus would still have all the same data. Like, if I got a new ipod, but put all the same music on it. Your music library is still there, just with a new look. Good point though

by Anonymous 14 years ago

uhm. Not to be too technical, but even as a freshman in a biology class..i know they are exact replicas...thats kind of what DNA replication is..and Mitosis..yeah...

by Anonymous 14 years ago

I'm pretty sure that you cannot regenerate your heart. I know that cells do regenerate. Can't remember where I heard that though.

by Anonymous 14 years ago

this has a lot of exceptions. but its still a pretty cool thought. we are basically an entirely new person

by Anonymous 14 years ago

I thought it was like every 24 hours or something for a lung cell to be "renewed" 7 years? really?

by Anonymous 14 years ago

24 hours is a little too short. even your blood cells get replaced every 2 weeks.

by Anonymous 14 years ago

Ooh... I thought it was faster than that

by Anonymous 14 years ago