Chapter 4 Tissues - 4-1Chapter 4Histology: The Study of

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Unformatted text preview: 4-1Chapter 4Histology: The Study of Tissues4-2HistologyTissue is a Group of similar cellscommon embryonic origincommon functionHistologystudy of tissuesPathologistlooks for tissue changes that indicate disease4-3Tissues and HistologyTissue Level of OrganizationEpithelial ConnectiveMuscleNervous4-4Tissues and HistologyEpithelial Tissuecovers surfaces because cells are in contact lines hollow organs, cavities and ductsforms glands when cells sink under the surfaceConnective Tissuematerial found between cellssupports and binds structures togetherstores energy as fatprovides immunity to disease4-5Tissues and HistologyMuscle Tissuecells shorten in length producing movementNerve Tissuecells that conduct electrical signals detects changes inside and outside the bodyresponds with nerve impulses4-6Embryonic TissueGerm layersEndodermInner layerForms lining of digestive tract and derivativesMesodermMiddle layerForms tissues as muscle, bone, blood vesselsEctodermOuter layerForms skin and neuroectoderm4-7Epithelium CharacteristicsConsists almost entirely of cellsCovers bodysurfaces and forms glandsHas freeand basal surfaceSpecialized cell contactsAvascularUndergoes mitosis4-8Functions of EpitheliaProtecting underlying structuresActing as barriersPermitting the passage of substancesSecretingsubstancesAbsorbingsubstances4-9Classification of EpitheliumClassified by arrangement of cells into layerssimple = one cell layer thickstratified = many cell layers thickpseudostratified = single layer of cells where all cells dont reach apical surfacenuclei at found at different levels so it looks multilayeredClassified by shape of surface cellssquamous =flatcuboidal = cube-shapedcolumnar = tall columntransitional = shape varies with tissue stretching4-10Simple Squamous EpitheliumSingle layer of flat cellslines blood vessels (endothelium), body cavities (mesothelium)very thin --- controls diffusion, osmosis and filtrationnuclei centrally locatedCells in direct contact with each other4-11Examples of Simple Squamous1.Surface view of lining of peritoneal cavity2.Section of intestinal showing serosa1.2.4-12Simple Cuboidal EpitheliumSingle layer of cube-shaped cells viewed from the sideNuclei round and centrally locatedLines tubes of kidneyAbsorption or secretion4-13Example of Simple CuboidalSectional view of kidney tubules4-14Nonciliated Simple ColumnarSingle layer rectangular cellsUnicellular glands =goblet cells secrete mucus...
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This note was uploaded on 06/06/2011 for the course BIO 180 taught by Professor Sarahbales during the Spring '11 term at Moraine Valley Community College.

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Chapter 4 Tissues - 4-1Chapter 4Histology: The Study of

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