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Originally Posted by Lucem Ferre
Don't all of our cells get replaced?
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I don't think so.
I think a large majority of our cells die and new ones take their place but for certain parts of our body, that is not the case. Besides the direct replacement of cells, I believe our stem cells have the ability to create copies via mitosis.
Just doing a quick google search now that I'm interested, I found the following from LiveScience (not the best source, but I doubt its really off the mark):
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Originally Posted by Live Science
Red blood cells live for about four months, while white blood cells live on average more than a year. Skin cells live about two or three weeks. Colon cells have it rough: They die off after about four days. Sperm cells have a life span of only about three days, while brain cells typically last an entire lifetime (neurons in the cerebral cortex, for example, are not replaced when they die).
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https://www.livescience.com/33179-do...ven-years.html