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TYPES OF REGENERATION -
Reparative
Restorative
1. It is limited to healing of wounds or replacement of cells
It can replace the lost part of body or produce a
complete organism from fragment
2. It involves minor cell proliferation & migration
It involves cell reproduction and differentiation
3. It occurs in all animals
Mainly in lower anim als
eg. Repair of a cut
1. Starfish
Replacement of skin cells , intestinal cells , blood cells
2. Wall lizard
3. Salamender
Middle piece - Structure of the Sperm Just behind the head, the small constriction (neck) carries a distal and a proximal centriole. The two lie at right angle to each other.
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