Exam (elaborations)
Straighterline bio 201l lab7 The Muscular System
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Straighterline bio 201l lab7 The Muscular System
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Lab 7 The Muscular Systemjcd jcd jcd jcd BIO201L
Straighterline bio 201l lab7 The Muscular jcd jcd jcd jcd jcd jcd
System
StudentjcdName:jcdColinjcdFiorentno
AccessjcdCodejcd(locatedjcdonjcdthejcdlidjcdofjcdyourjcdlabjcdkit):jcdAC-QLY23HC
Pre-Lab Questions
jcd
1. Howjcddojcdbandingjcdpatternsjcdchangejcdwhenjcdajcdmusclejcdcontracts?
Musclejcdcontractionjcdcausesjcdactinjcdandjcdmyosinjcdmyofilamentsjcdtojcddecreasejcdlengthjcdandjcdcomejcdt
ogether.jcdBothjcdthejcdHjcdandjcdIjcdzonesjcdbecomejcdnarrowjcdandjcdthejcdAjcdbandjcdhasjcdnojcdchange.
2. Whatjcdisjcdthejcddifferencejcdbetweenjcdajcdmusclejcdorgan,jcdajcdmusclejcdfiber,jcdmyofibriljcdandjcdajcdmyofila
ment?
Musclejcdorgansjcdarejcdtissuejcdcomposedjcdofjcdcellsjcdandjcdfibersjcdproducingjcdmovementjcdthroughou
tjcdthejcdbodyjcdthatjcdresultjcdinjcdcontractions.jcdMusclejcdfibersjcdarejcdcomposedjcdofjcdmyofibrilsjcdthatjcdcon
tractjcdwhenjcdstimulatedjcdandjcdtheyjcdhavejcdmultiplejcdnuclei.jcdMyofibrilsjcdarejcdthreadjcdlikejcdstructur
esjcdcomposedjcdofjcdactinjcdandjcdmyosin.jcdAndjcdmyofilamentsjcdarejcdthejcdstructuresjcdthatjcdmakejcdupjc
dmyofibrils.
3. Outlinejcdthejcdmolecularjcdmechanismjcdforjcdskeletaljcdmusclejcdcontraction.jcdAtjcdwhatjcdpointjcdisjcdAT
Pjcdusedjcdandjcdwhy?
ATPjcdbindsjcdtojcdmyosin,jcdwhichjcdthenjcdconvertsjcdATPjcdintojcdADPjcdandjcdpi.jcdCalciumjcdandjcdtroponinj
cdbindjcdtogetherjcdandjcdcreatejcdtropomyosin,jcdwhichjcdallowsjcdthejcdmyosinjcdheadsjcdtojcdformjcdcrossjcd
bridges.jcdThejcdADPjcdandjcdPijcdarejcdreleased,jcdcausingjcdactinjcdtojcdslidejcdtowardsjcdthejcdcenterjcdofjcdthejcds
arcomerejcdresultingjcdinjcdajcdpowerjcdstroke.jcdATPjcdisjcdusedjcdimmediatelyjcdtojcdcreatejcdanjcdincreasejcdi
njcdheartjcdratejcdandjcdbodyjcdtemperaturejcdtojcdallowjcdthejcdbodyjcdtojcdbejcdin.jcdhomeostasis.
4. Explainjcdwhyjcdrigorjcdmortisjcdoccurs.
Thisjcdoccursjcdbecausejcdthejcdmusclesjcdpartiallyjcdcontractjcdandjcdcannotjcdgojcdtojcdajcdrelaxedjcdstatejcdduejcdtoj
cdnojcdbloodjcdorjcdoxygenjcdflowingjcdthroughjcdthejcdbody.
Experiment 1: Tendons and Ligaments
jcd jcd jcd jcd
Post-LabjcdQuestions
1. Labeljcdthejcdarrowsjcdinjcdthejcdslidejcdimagesjcdbelowjcdbasedjcdonjcdyourjcdobservationsjcdfromjcdthejcdexper
iment.
A-jcdChondrocytes.
B-jcdcollagen.
C-jcdcollagenjcdfibers.
D-jcdskeletaljcdmusclejcdfiber.
E-jcdnuclei.
F-jcdcollagenjcdfibers.
,Lab 7 The Muscular System
jcd jcd jcd jcd BIO201L
, Lab 7 The Muscular System
jcd jcd jcd jcd BIO201L
2. Howjcddoesjcdthejcdextrajcdcellularjcdmatrixjcdofjcdconnectivejcdtissuesjcdcontributejcdtojcditsjcdfunction?
Thejcdextracellularjcdmatrixjcdbindsjcdtissuejcdtypesjcdthatjcdarejcddifferentjcdlikejcdbindingjcdthejcdepidermisjcdtojcdt
hejcddermisjcdlayerjcdthat’sjcdbeneathjcdit.
3. Whyjcdarejcdtendonsjcdandjcdligamentjcdtissuesjcddifficultjcdtojcdheal?
Bothjcdtendonsjcdandjcdligamentsjcdhavejcdnojcdbloodjcdsupplyjcdorjcdbloodjcdvesselsjcdthatjcdrunjcdthroughjcdthe
mjcdsojcdtheyjcddon’tjcdgetjcdnutrientsjcdthatjcdallowjcdorjcdhealing..
4. Whatjcddifferencejcddojcdyoujcdseejcdbetweenjcdthejcdtendonjcd–
jcdmusclejcdinsertionjcdimagejcdandjcdthejcdtendonjcdimage?
Thejcdtendonjcdmusclejcdinsertionjcdhasjcddensejcdirregularjcdconnectivejcdtissuejcdandjcdhasjcdchondrocytesjc
dandjcdcollagen.jcdThejcdtendonjcdisjcdsmoothjcdandjcdmovesjcdinjcdonejcddirectionjcdandjcdcontainsjcdmorejcdt
hanjcdonejcdnucleus..
5. Whatjcddifferencesjcddojcdyoujcdseejcdbetweenjcdthejcdtendonjcdandjcdligamentjcdsections?
Thejcdligamentjcdhasjcdskeletaljcdmusclejcdfibers,jcdandjcdthejcdtendonjcdseemsjcdtojcdbejcdclosejcdtogetherjcdwhilejc
dthejcdtendonjcdisjcdseparated..
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