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How many cells are being replaced in your body every day?

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For starters, one million red blood cells are removed and replaced each second.
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Why are stomach cells replaced every 2 days and red blood cells replaced every 120 days?

Your stomach cells are exposed to the harsh stomach acids, if they were not replaced as rapidly as they are the stomach acid would not be able to be contained thus digesting i

Why do scars remain if the body replaces its cells every 7 years?

It's because the repair process works from the bottom up A couple of sites agree as to why scars are permanent, but here's the clearest explanation I found: Unfortunately,