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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Because aldult meat, muscles and bones only can make more of the same and not new things. If you chop of the vinger, the bone will make a little new bone, the skin can be stretched to cover the stump and some muscle/meat and veins will form the blund end but a new bone and joint, the missing nail etc. can’t appear again.
To get a little away from 5 year old talk, human cells that have differentiated or gained a specific function and form such as bone, muscle, or structural can defide but only in more of the same type of cells. Some cells can barely do even that. Stemcells are needed to form new structures. And adults have some, but mostly concentrated as partially developed blood cells making your blood in bone marrow. Why do we not have more stemcells for healing? I am not sure but they are likely an investment to keep around and as there is no direct need why keep them?
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