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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Scar tissue is mostly emergency scaffolding that’s put into place as a quick fix. It isnt made of cells, though it is slowly replaced by living cells.
Thing is, the stuff that breaks down scar tissue to allow normal cells to come and replace them can’t get to it all of the scar is dense enough. So big scars will last a long time because of this.
That’s why a lot of the time doctors will tell you you gotta stretch muscles that have been worked on in surgery after they have healed, even if it hurts. Their are also tools for breaking down scar tissue on the skin.
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