Four Types of Tissues -...

FourTypesofTissues•  Tissuesarecollec8onsofcellsandcellproductsthatperformspecific,limited

func8ons

•  FourTypesof8ssue– Epithelial*ssue

•  Coversexposedsurfaces•  Linesinternalpassageways•  Formsglands

FourTypesofTissues•  FourTypesofTissue(cont’d)

–  Connec*ve*ssue•  Fillsinternalspaces•  Supportsother8ssues•  Transportsmaterials

•  Storesenergy

– Muscle*ssue•  Specializedforcontrac8on•  Skeletalmuscle,cardiacmuscle,&smoothmuscle

–  Neural*ssue•  Carrieselectricalsignalsfromonepartofthebodytoanother

EpithelialTissues

•  Epithelia– Layersofcellscoveringinternalorexternalsurfaces

•  Glands– Structuresthatproducesecre8ons

EpithelialTissues

•  Characteris*csofEpithelia– Cellularity(celljunc8ons)

– Polarity(apicalandbasalsurfaces)

– AQachment(basallamina)

– Avascularity

– Regenera8on

EpithelialTissues

Figure4–1ThePolarityofEpithelialCells.

EpithelialTissues

•  Func*onsofEpithelialTissue– Providephysicalprotec8on

– Controlpermeability

– Providesensa8on

– Producespecializedsecre8ons(glandularepithelium)

EpithelialTissues

•  MaintainingtheIntegrityofEpithelia

–  Intercellularconnec8ons

– AQachmenttobasallamina

– Epithelialmaintenanceandrepair

EpithelialTissues

•  IntercellularConnec8ons–  Celljunc8ons

•  Formbondswithothercellsorextracellularmaterial:

–  Tightjunc*ons

–  Gapjunc*ons

EpithelialTissues

•  CellJunc8ons– Tightjunc8ons—betweentwoplasmamembranes

•  Preventspassageofwaterandsolutes•  Isolateswastesinthelumen

– Gapjunc8ons—allowrapidcommunica8on•  Heldtogetherbychannelproteins•  Allowionstopass

EpithelialTissues•  CellJunc8ons– Desmosomes

• Actasintercellularcement

•  Spotdesmosomes– 8ecellstogether– allowbendingandtwis8ng

EpithelialTissues

•  EpithelialMaintenanceandRepair

– Epitheliaarereplacedbydivisionofstemcells

– Nearbasallamina

Classifica8onofEpithelia•  Singularepithelium;pluralepithelia

•  ClassesofEpithelia–  Basedonshape

•  Squamousepithelia:thinandflat

•  Cuboidalepithelia:squareshaped•  Columnarepithelia:tall,slenderrectangles

–  Basedonlayers•  Simpleepithelium:singlelayerofcells

•  Stra8fiedepithelium:severallayersofcells

Classifica8onofEpithelia

Figure4–3SquamousEpithelia.

Figure4–4CuboidalEpithelia.

Figure4–5ColumnarEpithelia.

Four Types of Tissues -...

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