If all human cells replace themselves every 7 years, why can scars remain on you body your entire life?
In: Biology
There’s some great explanations of the questions, but I’d like to add that afaik scars are constantly being maintained by the body. Some infections (scurvy is one) can cause scars to fail and open the old wound due to lack of resources in the body, particularly collagen which is what scars are built from.
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