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Unformatted text preview: rder to maintain a constant number of cells in adult tissues and organs, cell death must be balanced by cell proliferation. This material cannot be copied, reproduced, manufactured, or disseminated in any form without express written permission from the publisher. © 2009 Sinauer Associates, Inc. 13 UNCORRECTED PAGE PROOFS 14 CHAPTER 17 FIGURE 17.13 Skin fibroblasts Scanning electron micrograph of a fibroblast surrounded by collagen fibrils. (© CMEABG-UCBL/Photo Researchers, Inc.) In order to maintain this balance, most tissues contain cells that are able to proliferate as required to replace cells that have died. Moreover, in some tissues a subpopulation of cells divide continuously throughout life to replace cells that have a high rate of turnover in adult animals. Cell death and cell renewal are thus carefully balanced to maintain properly sized and functioning adult tissues and organs. Proliferation of Differentiated Cells Most types of differentiated cells in adult animals are no longer capable of proliferation. If these cells are lost, they are replaced by the proliferation of less differentiated cells...
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This note was uploaded on 08/25/2009 for the course BIO 315 taught by Professor Steiner during the Spring '08 term at Kentucky.

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