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1、CytoplasmandCytoskeletonBy:TimYacoubandLizetteMagdalenoCytoskeletonOverviewCytoskeletonisa“networkoffibersthatextend[s]throughoutthecytoplasm,”(113).It’sthreestructures:microtubules,microfilaments,andintermediatefilamentsIthelpswiththeorganizationofactivities,cellmobilit
2、y,andstructureofthecellCytoskeleton:MicrotubulesInalleukaryoticcells,Shape:hallowtubesMadefromproteincalledtubulinbycentriolesHelpshapeandsupportthecell,Compression-resistant,functionasroadsformobileorganellestomovealong.Aidinchromosomeseparationincelldivision.Specialarr
3、angementofmicrotubulesformflagellaandcilia.Cytoskeleton:MicrofilamentsInalleukaryoticcells,Shape:thinsolidrodsMadefromaglobularprotein:Actin,(twisteddoublechainofactinsubunits).Functionsasatensionbearer,networksinsidetheplasmamembranetosupportcellshape,thislayeriscalleda
4、cortex.Wellknownforitsaidincellmovement,actin,alongwithMyosininteract,forexample,tocontractmusclecellsCytoskeleton:IntermediateFilamentsCoiledcables,largerthanmicrofilamentsbutsmallerthanmicrotubulesMadeofseveralproteinssimilartokeratinsOnlyinsomeanimalcells,bearstension
5、(likemicrofilaments)MoreofapermanentstructurewithinthecytoskeletonReinforcesshapeofcell,andanchorscertainorganelleswithinthecytoplasmCytoplasmOverviewCytoplasmis“thecontentsofthecellboundedbytheplasmamembrane,ineukaryotes,theportionexclusiveofthenucleus.”(G-9)Cytoplasm:S
6、tructureItistheFluidwherethecellularorganellesaresuspended.Itfillsupallthespacesinthecellthatarenotbeingfilledbytheorganelles3ResidentsofCytoplasm:1.Cytosol2.Organelles3.CytoplasmicInclusionsCytoplasm:CharacteristicsFluidsubstancethatfillsthespacebetweenthecellmembranean
7、dcellularorganellesHighpercentageofwaterItiscolloidalItcontainsproteins90%waterand10%organicandinorganiccompounds8Cytoplasm:ZonesPlasmogel-peripheralzoneofcytoplasmthatisthickandjelly-likePlasmosol-zoneisthinandliquefiedCytoplasm:FunctionSiteofmanybiochemicalreactionsPla
8、cewherecellexpandsandgrowsProvidesamediumfororganellestoremainsuspendedAidsinmovementofdifferentcellula
