Human Regeneration In Humans

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Regeneration is the process of renewal or restoration of a body, bodily part, or biological system after injury or as a normal process. It is the process that makes genomes, cells, organisms flexible to natural changes that cause disturbance or damage. Every species is capable of regeneration, from bacteria to humans. Regeneration can be two types - it can either be complete where the new tissue is the same as the lost tissue, or incomplete where the necrotic tissue comes fibrosis. A number of organs have the intrinsic ability to regenerate, a distinctive feature that varies among organisms. Regeneration in humans is the regrowth of lost or damaged tissues or organs in response to injury. This is in different from wound healing, which involves…show more content…
3) Autotomy In some animals some part of the body is broken off by the animal itself on being threatened by the predator. This phenomenon of self mutilation is called autotomy. Eg) • Crabs break off their leg on threatened by the enemy • Starfish breaks off an arm 4) Super regeneration The development of extra number of organs or parts of the body is known as super regeneration . In planarian, earthworm or other lower animals, small wound or incision on the body may cause the development of a head or a tail. If the wound is near the head, an additional head is regenerated. If it is near the tail an additional tail is formed. Types of Regeneration based on Cellular Mechanism 1)Morphallaxis This type of regeneration is without cell proliferation. It occurs by the remodelling of existing tissues, involving little new growth. As a result, the regenerated individual is initially much smaller but after normal feeding subsequently increases its size. This type of regeneration is known as morphallaxis or morphallactic regeneration. Example: Regeneration of hydra from a small fragment of its…show more content…
These cell mass are proliferating and accumulate under the epidermis, which expands and within two days, bulge transforms into a conical hump. This lump of dedifferentiated cells along with the epidermal covering is called regeneration bud or regeneration blastema. The dedifferentiated cells continue to proliferate and eventually transforms into a limb. This type of regeneration is known as epimorphosis or epimorphic regeneration. Example: Limb regeneration in amphibians. Events in Regeneration Regeneration process in higher animals involves a series of complicated histological transformations. Following events occur in the regeneration of limbs. (i) Wound Healing: When an injury is caused to an organ it results in exposure of the interior tissues to the outer environment . Some cells in the injured region get destroyed. This may cause bleeding at the injured surface and the blood soon clots and blocks further flow of blood to the outside. Then the epidermal cells proliferate and migrate from all sides towards the centre of the wound. Thus the epithelium forms a complete covering over the injured tissues underneath the blood clot. The time needed for such a healing process depends on the size of the

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