chapter 8 worksheet #3 name: the figure below is a

Chapter8Worksheet#3Name:_____________________________

Thefigurebelowisadiagrammaticrepresentationofasmallportionofarelaxedmusclecell(thebracketindicatestheportionthathasbeenenlarged).IndiagramII,bracketandlabelanAband,anIband,Hzoneandasarcomere.AddarrowstolabelaZlineandaMline.Thenmatchthenumberedlines(1,2,&3)inDiagramIItothecrosssections(X,Y&Z)inDiagramIII.

DiagramI

DiagramII

DiagramIII

X=# Y=# Z=#

Completethefollowingstatementsrelatingtotheneuromuscularjunction.Insertthecorrectanswersinthenumberedanswerblanks. 1.Amotorneuronandalloftheskeletalmusclecellsitstimulatesis calleda(1).Theaxonofeachmotorneuronhasnumerousendings2.called(2).Theactualgapbetweenanaxonalendingandthemuscle 3.celliscalleda(3).Withintheaxonalendingsaremanysmallvesicles 4.containinganeurotransmittersubstancecalled(4) 5.Whenthe(5)reachestheendsoftheaxon,theneurotransmitteris released,anditdiffusestothemusclecellmembranetocombinewith receptorsthere.Bindingoftheneurotransmitterswithmuscle membranereceptorscausesthemembranetobecomepermeableto 6.sodium,resultingintheinfluxofsodiumionsand(6)ofthemembrane.Thefigurebelowshowsthecomponentsofaneuromuscularjunction.Identifythepartsbycoloringthecodingcirclesandthecorrespondingstructuresinthediagram.AddsmallarrowstoindicatethelocationoftheAChreceptorsandlabelappropriately. Mitochondrion Ttubule Sarcomere Synapticvesicles Synapticcleft

JunctionalFolds

Relativetogeneralterminologyconcerningmuscleactivity,firstlabelthefollowingstructuresonthefigurebelow:insertion,origin,tendon,restingmuscle,andcontractingmuscle.Next,identifythetwostructuresnamedbelowbychoosingdifferentcolorsforthecodingcirclesandthecorrespondingstructuresinthefigure. Moveablebone Immovablebone