Centralization

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Centralization

 

in biology, the evolutionary development of a single organ or a single organic system formed by the union of individual cells, tissues, or organs that perform related functions. An example of centralization is the concentration of diffusely distributed nerve cells into nerve trunks in the turbellarians; another example is the development of the vertebrates’ kidney from the metameric nephridia of the cephalochordata. Centralization is usually associated with the broadening and intensification of functions.