GENERAL HISTOLOGY

Detailed explanation-1: -Regeneration part Sponge, Coelenterate, Flatworm Whole body reconstituted form smaller body fragment containing special cells. Arthropoda Limb regeneration in some Arthropoda as Insects, Spiders, Crustaceans. Mammals Compensatory regeneration. Some tissues as skin, liver and kidney.

Detailed explanation-2: -There are three types of regen options: passive, active and manual.

Detailed explanation-3: -Myogenesis. All echinoderms have the capability to regenerate some or most organs or appendages. Since the regenerated structures are usually identical to the lost ones, including their muscular components, it has then been assumed that formation of new muscle cells or myogenesis occurs in all echinoderms.

Detailed explanation-4: -The first mechanism involves the dedifferentiation of adult structures to form an undifferentiated mass of cells that then becomes respecified. This type of regeneration is called epimorphosis and is characteristic of regenerating limbs. The second mechanism is called morphallaxis.