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

Chapter 8 Worksheet #3 Name: _____________________________ The figure below is a diagrammatic representation of a small portion of a relaxed muscle cell (the bracket indicates the portion that has been enlarged). In diagram II, bracket and label an A band, an I band, H zone and a sarcomere. Add arrows to label a Z line and a M line. Then match the numbered lines (1,2, & 3) in Diagram II to the cross sections (X, Y & Z) in Diagram III. Diagram I Diagram II Diagram III X=# Y= # Z= #

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Chapter8Worksheet#3Name:_____________________________

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

DiagramI

DiagramII

DiagramIII

X=# Y=# Z=#

Page 2: Chapter 8 Worksheet #3 Name: The figure below is a

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

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Page 3: Chapter 8 Worksheet #3 Name: The figure below is a

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