If they say that all human cells replace themselves every 7 years or so, why can scars remain on your body for the entire life?
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Interesting…..I had a scar from a deep cut on my left index finger knuckle from when I was like 6 years old and it disappeared by now, i’m 32.
If it works dont change or modify it.
Body changes scar cells with same scar cells so it remains same.
The cells get replaced by being ‘copied’ so when mistakes are made/created they are also copied.
This why/how ageing happens, mistakes in the system of copying and reproducing the cell are retained.
It’s a very complex system so it’s amazing it works properly at all. The minimal mistakes that happen are not surprising.
What exactly is a scar and why doesn’t the body just use normal skin instead of scar tissue to repair cuts? Is a scar a different kind of skin?
Which cells are never replaced, and are as old as we are?
Imagine the body like a building.
The connective tissue (collagen mostly) = [steel skeleton](https://www.dreamstime.com/steel-skeleton-tall-building-under-construction-crane-tower-steel-skeleton-tall-building-under-construction-crane-image123978264)
The human cells = the bricks, windows, doors, everything in between.
A scar is usually a damage to this steel skeleton not the bricks/walls because they can always be changed.
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