When a piece of skin, muscle, bone, nails, or hair gets removed or damaged, those usually grow back like nothing happened. So, why isn’t it possible for hands, or even something smaller like a finger to regrow? Or would a piece of meat just regrow there instead of something useful?
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The way I’ve seen it explained before, stem cells are like blind construction workers.
If you take a door out of it’s frame, the blind construction worker could feel around and assume it’s a doorframe and eventually install a new one.
If you cut out the doorframe, or take the whole wall, they’re not going to know what was previously there.
Stem cells do kind of the same thing. Small injuries are easy to tell how to fix. Big injuries are less clear how it should be fixed.
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