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The intestine provides an excellent example of stem

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Unformatted text preview: stine is lined by a single layer of epithelial cells that are responsible for the digestion of food and absorption of nutrients. These intestinal epithelial cells are exposed to an extraordinarily harsh environment and have a lifetime of only a few days before they die by apoptosis and are shed into the digestive tract. Renewal of the intestinal epithelium is therefore a continual process throughout life. New cells This material cannot be copied, reproduced, manufactured, or disseminated in any form without express written permission from the publisher. © 2009 Sinauer Associates, Inc. 17 UNCORRECTED PAGE PROOFS 18 CHAPTER 17 Hematopoietic stem cell Myeloid Reticulocyte Megakaryocyte Lymphoid Monocyte Erythrocyte Platelets Neutrophil Macrophage Eosinophil Basophil B lymphocyte T lymphocyte Granulocytes FIGURE 17.18 Formation of blood cells All of the different types of blood cells develop from a hematopoietic stem cell in the bone marrow. The precursors of differentiated cells undergo several rounds of cell division before they differentiate. are derived from th...
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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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