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| Definitions |
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 Accretionary growth: Post embryonic growth in some special cells to reinforce and replace the worn out differentiated cells. |
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 Ageing: Progressive deterioration in the structures and functions of cells tissues and organs. |
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 Aldolase: An enzyme secreted by the liver. |
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 Autotomy: A spontaneous self mutilation of body where lost parts are restored by regeneration process. |
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 Auxetic growth: Volume of the body increases due to growth of body cells and not by increase in the number of cells. |
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 Blastema: Cellular aggregation of newly formed cells to heal the injury. |
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 Degrowth: Catabolism of the body is greater than anabolism and reserve food is utilized for performing normal metabolism. |
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 Epimorphosis: Proliferation of new cells from the surface of wound to reform the severed body parts. |
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 Gerontology: A branch of Biology dealing with the ageing process. |
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 Lag Phase: Period of slow growth. |
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 Morphallaxis: The reconstitution of the whole body even from a small fragment of body part. |
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 Regeneration: A replacement, repair or restoration of lost or damaged body parts. |
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 Reparative Regeneration: Repairing of some body parts due to proliferation of localized cells from the edges of wound. |
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 Restorative Regeneration: Regeneration of severed body parts from left out fragment of the body. |
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