If all human cells replace themselves every 7 years, why can scars remain on you body your entire life?
In: Biology
Because the scar tissue is getting replaced with newer scar tissue. That’s also why scars can fade and shrink over the years; the surrounding skin cells can sort of fill in some of where a new scar had originally been.
But your body isn’t reproducing your whole body again in 7 years, like a new car model. It’s constantly replacing cells, ~~b~~millions are being made every second. And they’re replacing it with the same thing that’s already there, so if it’s a scar, it’s going to mostly stay a scar.
Latest Answers