tailieunhanh - CURRENT FRONTIERS AND PERSPECTIVES IN CELL BIOLOGY

Epithelial cells cover the body (. skin), cavities (. stomach, uterus, bladder) and ducts (. renal tubules, intestine) of multicellular organisms, and thus constitute the frontier between the individual and the external milieu. In areas that withstand strong mechanical or chemical stress (. skin, esophagus, cornea, vagina) epithelia are stratified, whereas in the rest of the body, the epithelia independently of their morphology (. columnar of the intestine, tubular of renal tubules, squamous of the lung), are organized in monolayers (Fig 1A). Epithelia protect the tissues that lie beneath, from microorganisms, toxins, trauma and water evaporation, and regulate the exchange of substances between the content of body cavities. | CURRENT FRONTIERS AND PERSPECTIVES IN CELL BIOLOGY Edited by Stevo Najman CURRENT FRONTIERS AND PERSPECTIVES IN CELL BIOLOGY Edited by Stevo Najman Current Frontiers and Perspectives in Cell Biology Edited by Stevo Najman Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. As for readers this license allows users to download copy and build upon published chapters even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Vedran Greblo Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published April 2012 Printed in Croatia A free online edition of this book is available at Additional hard copies can be obtained from orders@ Current Frontiers and Perspectives in Cell Biology Edited by Stevo Najman p. cm. ISBN .