Four Types of Tissues -...
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FourTypesofTissues• Tissuesarecollec8onsofcellsandcellproductsthatperformspecific,limited
func8ons
• FourTypesof8ssue– Epithelial*ssue
• Coversexposedsurfaces• Linesinternalpassageways• Formsglands
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
FourTypesofTissues• FourTypesofTissue(cont’d)
– Connec*ve*ssue• Fillsinternalspaces• Supportsother8ssues• Transportsmaterials
• Storesenergy
– Muscle*ssue• Specializedforcontrac8on• Skeletalmuscle,cardiacmuscle,&smoothmuscle
– Neural*ssue• Carrieselectricalsignalsfromonepartofthebodytoanother
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EpithelialTissues
• Epithelia– Layersofcellscoveringinternalorexternalsurfaces
• Glands– Structuresthatproducesecre8ons
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EpithelialTissues
• Characteris*csofEpithelia– Cellularity(celljunc8ons)
– Polarity(apicalandbasalsurfaces)
– AQachment(basallamina)
– Avascularity
– Regenera8on
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EpithelialTissues
Figure4–1ThePolarityofEpithelialCells.
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EpithelialTissues
• Func*onsofEpithelialTissue– Providephysicalprotec8on
– Controlpermeability
– Providesensa8on
– Producespecializedsecre8ons(glandularepithelium)
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EpithelialTissues
• MaintainingtheIntegrityofEpithelia
– Intercellularconnec8ons
– AQachmenttobasallamina
– Epithelialmaintenanceandrepair
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
EpithelialTissues
• IntercellularConnec8ons– Celljunc8ons
• Formbondswithothercellsorextracellularmaterial:
– Tightjunc*ons
– Gapjunc*ons
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EpithelialTissues
• CellJunc8ons– Tightjunc8ons—betweentwoplasmamembranes
• Preventspassageofwaterandsolutes• Isolateswastesinthelumen
– Gapjunc8ons—allowrapidcommunica8on• Heldtogetherbychannelproteins• Allowionstopass
Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
EpithelialTissues• CellJunc8ons– Desmosomes
• Actasintercellularcement
• Spotdesmosomes– 8ecellstogether– allowbendingandtwis8ng
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EpithelialTissues
• EpithelialMaintenanceandRepair
– Epitheliaarereplacedbydivisionofstemcells
– Nearbasallamina
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Classifica8onofEpithelia• Singularepithelium;pluralepithelia
• ClassesofEpithelia– Basedonshape
• Squamousepithelia:thinandflat
• Cuboidalepithelia:squareshaped• Columnarepithelia:tall,slenderrectangles
– Basedonlayers• Simpleepithelium:singlelayerofcells
• Stra8fiedepithelium:severallayersofcells
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
Figure4–3SquamousEpithelia.
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
Figure4–3SquamousEpithelia.
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Classifica8onofEpithelia
Figure4–4CuboidalEpithelia.
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Classifica8onofEpithelia
Figure4–4CuboidalEpithelia.
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
Figure4–4CuboidalEpithelia.
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Classifica8onofEpithelia
Figure4–5ColumnarEpithelia.
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
Figure4–5ColumnarEpithelia.
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Copyright©2009PearsonEduca8on,Inc.,publishingasPearsonBenjaminCummings
Classifica8onofEpithelia
Figure4–5ColumnarEpithelia.