University:
Brigham Young University
Course:
CELL 205 | Human Biology
Academic year:

2023
Views:

397

Pages:

6
Author:

InterstellarInsight

mimpal Regeneration It is a post-embryonic morphogenic process. Regeneration is the body's ability to replace or regenerate lost or damaged body parts. @marphollaxis Type There are a types of regeneration- Epimorphic Type Marphallaxis. Type—In this type of regeneration, a cut piece of the body part produces a new individual. g-Piece of Hydra. Planaria and others invertebrate Epimorphic type - In this type of regeneration the recidual part of the body or eut end show generate and underyces replacement of the lost body part. Marphollaxis type of Regeneration If occurs in sponge and coctentrate In sponges - A small cut peace of Archeocytes celt which an totipetent cell. ② It occurs into due to presence of ① A small cut peace of the living body give rise to complete individual. ② It occurs into due to presence of Archeocytes cell which are totipotent. ⑧ If the body of a living sponge is serached and the cell are seperate. ④ If such seperate cell are kept in a favourable condition they recognise to form the complete animal. In Coelentrates (Hydra) @, Abraham Tremble described it in 1740. If living hydra is cut across in sto s or more peace, each peace will grow the Complete individual. missing part and farm a the cut peace show definite polarity ir anterior Gurface form the mouth and tenticle. ④ while the posterior surface form the tail. In Platyhelminthes :- @ Class Turbellaria sy- Planaria @9f a living planaria is cut peaces, each and farm a 901055 piece will produce in 2-3 or more the complete individual. missing part Head Cut prece Adult warm ⑧ The cut piece show definite polarity ie anterior. surface farm the mouth end while the posterior surface farm the tail. In Echinodermata :- In an arm is cut across at any level, the ent piect regenate the last part and farm Individual [ses cucumber). a new Epimorphic type of Regeneration In Coelentrates (Hydra) - "Abraham Tremble" medially cut the anterior portion of a living Hydra. In two complete halurs. My 7 headed monster Hydra ①fach cut end develops the missing part (mouth, tenticle) thus two headed hydra was produced. Bisimilar repeated cut experiment trempte succided in getting a headed monster hydra. Thus process is called heteromorphosis In platyhelminthes - Iubetlaria y Planariq Like the hydra if the head reason is cut longitudinally in two complete halves, the eut partion regenerate, the lost part and thus two headed planpria are produced. Ampleted Rageneration * In Urodella the phenomenon is seen in satamendar and Axolatol larva *ly any of the limb is end an any loved the cut partion dies and degenerate beat the cut end gradually regenerate to develops the loss part of the limb. * During this process you can see following changes - •li] Epidermis of the cut end proliferate proud and covers the open surface of the wound. [ii] Blastema is formed below the epidermis. it contain some cells of bons comective tissue. some of cantitage and some of (ii) this specilized cell dedifferenciated to jarm generlized call and this generalized cell undergo proliferation so the mass like spructure are formed it leads to the formation of bud like structure. New bud gradually grew and elongates. [iv] the cell of Blastema now undergo metaplasia ire they produce to the tissue of the bone, comective tissue and cartilage. [2]quus the bud takes the shape of the lost limb.

Regeneration Textbook Note

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