Chamberlain Bios 252 Exam 2.

CHAMBERLAIN BIOS 252 EXAM 1




skeletal43muscle43-43answer---43long,43thin,43cylindrical43in43shape
-43multinucleated
-43attached43to43bone43&43skin43
-43voluntary
-43striated

cardiac43muscle43-43answer---43short,43fat,43branched
-43uninucleated
-43in43heart
-43attached43to43intercalated43discs
-43involuntary
-43striated

smooth43muscle43-43answer---43in43hollow43organs
-43ininucleated43
-43involuntary
-43lack43striations

excitability43-43answer--
responsiveness43to43chemical43signals,43stretch,43and43electrical43changes43across43the
43plasma43membrane


conductivity43-43answer--
local43electrical43excitation43sets43off43a43wave43of43excitation43that43travels43along43the4
3muscle43fiber


contractility43-43answer--shortens43when43stim

extensibility43-43answer--capable43of43being43stretched43b/w43contractions

elasticity43-43answer--returns43to43its43original43rest43length43after43being43stretched

organization43of43skeletal43muscle43-43answer--
microfilaments,43myofibril,43muscle43fiber,43muscle43fascicle,43and43skeletal43muscle

, endomysium43-43answer--thin43sleeve43of43loose43CT43around43each43fiber

perimysium43-43answer--thicker43layer43of43CT43that43wraps43fascicles

fascicles43-43answer--bundles43of43muscle43fibers43wrapped43together

epimysium43-43answer--fibrous43sheath43surrounding43entire43muscle

what43are43the43components43of43the43sarcomere43-43answer--
z43disc,43m43line,43a43band,43i43band,43zone43of43overlap,43thick43filament,43thin43filament
,43zone43of43overlap,43sarcomere

z43disc43-43answer--narrow,43plate-
shaped43regions43of43dense43materials43that43separate43on43sarcomere43from43the43nex
t

a43band43-43answer--
dark,43middle43part43of43sarcomere43that43extends43entire43length43of43thick43filaments43
&43includes43those43part43of43thin43filaments43that43overlap43thick43filament43s

i43band43-43answer--
lighter,43less43dense43area43of43sarcomere43that43contains43remainder43of43thin43filamen
ts43but43no43thick43filaments43
43*43z43disc43passes43thru43center43of43each43I43band


h43zone43-43answer--
narrow43region43in43center43of43each43a43band43that43contains43thick43filaments43but43no
43thin43filaments


m43line43-43answer--
region43in43center43of43h43zone43that43contains43proteins43that43hold43thick43filament43to
gether43at43center43of43sarcomere

fibrous43(F)43actin43-43answer--243intertwined43strands
43-43string43of43globular43(G)43actin43subunits43each43w/
43active43site43that43can43bind43head43of43myosin43molecule


troponin43molecule43-43answer--small,43Ca2+-
43binding43protein43on43each43tropomyosin43molecule


1st43step43of43sliding43filament43theory43-43answer--
myosin43pulls43on43actin,43causing43thin43filament43to43slide43inward
43*43ratchet43along43filaments