If our arm or leg gets sliced off, why can’t our body recognize and repair the severed limb if it’s sewn back together?
In: Biology
We can and do. The tricky part is connecting ALL the blood vessels and ALL the nerves, joints, tendons etc. Replantation surgeries are practiced, but they only happen within a certain time window (like hours) and usually only on some limbs where there’s a chance of it actually working like hands/fingers). It is also only used for some types of injuries (where there’s a clean sharp cut) because if the tissues have been severely damaged there’s less chance of reattachment. Few injuries are however nice and clean…
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