Regeneration of zoology signifies the reproduction natural restoration, of the body parts, whether externally or internally, lost by injury. This power of renewal in all living creatures belongs to some degree, and is one of the distinguishing features of organic, from inorganic nature. A broken crystal may rebuild itself when it is allowed to remain it for a suitable time in a saturated solution of the mineral or chemicals of which it consists; but this renewal is accomplished wholly by external accretion of new material, whereas an animal regenerates its lost parts wholly by supplies the ordinary process of food-assimilation and growth.
This power is most manifest, as might be predicted, in the animals of the simplest organization, and in those most exposed to serious mutations, and decreases in a varying scale as organisms become more and more complex, until in the higher vertebrates (except lizards), it is limited to the healing of wounds. This is what surgeons call grafting, that is, the organic attachment of new flesh to old, as when detached skin is placed over a flayed surface, might be classified here, but it is an artificial regeneration
Among such lowly animals as protozoans, cœlenterates, echinoderms and worms, the power of regeneration is very much importance and great, although it appears much inequality and with some strange irregularities; among crustaceans it is strong in some groups and among the vertebrates it is confined mainly to the amphibians and the lizards
- Factors controlling the regeneration(Ex:Nervuos system , Animal Size)
- Regenerative capacity in invertebrate and vertebrate animals
- Regeneration based on cellular mechanism