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Chapter-4-Tissues.pdf - MTY1102- CHAPTER 4- LECTURE OUTLINE...

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MTY1102- CHAPTER 4- LECTURE OUTLINETissuesA group of cells with similar structure andfunction, plus extracellular substancesurrounding them.Histologyis the study of tissuesThere are four tissue types in the human body:1.Epitheliala covering or lining tissue2.Connective- A diverse primary tissue typethat makes up part of every organ in thebody3.Muscle- a tissue that contracts orshortens, making movement possible4.Nervous- responsible for coordinatingand controlling many body activities.Epithelial TissuesCovers and Protects surfaces, both outside aninside the body.Included under the classification of epithelialtissue are theExocrine and Endocrine----glands.Epithelial Tissue Characteristics1.Mostly composed of cells2.Covers body Surfaces3.Distinct Cell Surfaces4.Cell and matrix Connections5.Nonvascular6.Capable of regenerationCharacteristics of Epithelium5.Absorption of substancesClassification of EpitheliaEpithelial tissues are classified primarily accordingtothe number of cell layersand theshape of thesuperficial cells.The Cell layers can beSimple, stratified orpseudostratified.The Cell shapes can beSquamous, cuboidal,columnar, or special transitional shape,thatvaries with the degree of stretch.Based on Cell Layers:Simple EpitheliumConsists ofsingle layer ofcells,with each cell extending from the basementmembrane to the free surfaceStratified epitheliumConsist ofmore than onelayer of cells, but only basal layer attaches thedeepest layer to the basement membrane.Pseudostratified columnar epitheliumis aspecial type of simple epithelium, that appears tobe falsely stratified.-It consist ofone layer of cells, with all the cellsattached to the basement membrane.-Due to variations in the shape of the cells, theepithelia appears stratified.Based on idealized shapes of the epithelial cells:Squamous cellsare flat or saclike.Cuboidal cellsare cubed-shapedabout aswide as they are tall.Columnar cellstend to be taller than they arewide.Simple Squamous EpitheliumSingle layer of thin, flat cells.Some substances easily pass through this thinlayer of cells, but other substances do not.Example:Lungssimple squamous epithelium,allows for gas exchange.KidneysSimple squamous epithelium helps filterwastes from the blood while keeping blood cellsinside the blood vessels.Functions of Epithelial Tissues1.Protects underlying structures2.Acts as a barrier3.Permits passage of substances4.Secretes substances
MTY1102- CHAPTER 4- LECTURE OUTLINESimple Cuboidal EpitheliumIs a single layer cube-like cells that carry outactive transport, facilitated diffusion, orsecretion.They have a greater secretory capacity thansimple squamous epithelial cells.

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