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FIZIOLOGIA FIBREI MUSculara

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FIZIOLOGIA FIBREI MUSculara
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  FIZIOLOGIA FIBREI MUSCULARESUMAR FIZIOLOGIA FIBREI MUSCULARE1. FIZIOLOGIA FIBREI MUSCULARE STRIATE DE TIP SCHELETIC1.1. Organizarea morfofn! iona#a a $%rei m&! 1'1!'(% #are &!)e#e i!e1.'. Fizio#ogia *#a!ii mo orii 1.+. C*#area e,!i a ie-!on ra! ie in $%ra m&!#ara &!)e#e i!a1.(. Me!ani&m# !on ra! iei m&!#are in $%ra m&!#ara &!)e#e i!a1.. Uni a ea mo orie  1./. Ti*ri 0e !on ra! ii a#e $%rei m&!#are &!)e#e i!e'. FIZIOLOGIA FIBREI MUSCULARE ETEDE'.1. Par i!#ari a i & r! ra#e a#e $%rei m&!#are ne e0e'.'. C*#area e,!i a ie-!on ra! ie in $%ra m&!#ara ne e0a'.+. Me!ani&m# !on ra! iei in $%ra m&!#ara ne e0a'.(. Me!ani&me 0e reg#area a !on ra! iei $%rei m&!#are ne e0e'.. C#a&i$!area fn! iona#a a $%re#or m&!#are ne e0e    Da!a in !az# neroni#or e,!i a%i#i a ea e& e im*#i!a a in *ro0!erea &i *ro*agarea im*#&ri#or ner2oa&e ! ro# in !oor0onarea a! i2i a ii efe! ori#or in fn! ie 0e aferen e#e &enzi i2e3 in !az# m&!)i#or e,!i a%i#i a ea e& e #ega a 0e generarea nor *o en ia#e 0e a! ine !e 0e ermina o a! i2i a e me!ani!a &*e!i$!a - !on ra! ia m&!#ara. Forman0 a*ro,ima i2 45 0in gre a ea !or*#i3 e& # m&!#ar e& e re*rezen a in *ro*or ie 0e (6 0e m&!)i# & ria &!)e#e i!3 re& # $in0 m&!)i# ne e0 &i m&!)i# & ria !ar0ia!. 1. FIZIOLOGIA FIBREI MUSCULARE STRIATE DE TIP SCHELETIC1.1. Organizarea morfofn! iona#a a $%rei m&! 1'1!'(% #are &!)e#e i!eFi%ra m&!#ara & ria a are o forma !2a&i!i#in0ri!a3 ! n 0iame r !e 2ariaza in re ' &i 144 mm &i o #ngime 0e 1-+44 mm. Ci o*#a&ma $%rei m&!#are e& e organiza a in78 !i o*#a&ma !on ra! i#a 9ino*#a&ma: - !*rin0e a*ara # !on ra! i# 9mio$%ri#e#e:;  8 !i o*#a&ma ne!on ra! i#a - !*rin0e nmero&i n!#ei3 organi e !e##are !omne &i & r! ri &*e!i$!e $%rei m&!#are - &i& em# &ar!o %#ar &i miog#o%ina. a. Mio$%ri#e#e &n organi e &*e!ia#e !on ra! i#e ! o gro&ime 0e 43'-' mm3 0i&*&e *e in reaga #ngime a $%rei m&!#are3 o!*an0 a*ro,ima i2 <45 0in 2o#m# a!e& eia. Sn a#!a i e 0in r-o &!!e&ine 0e %enzi &a 0i&!ri3 !are &n 0e 0oa i*ri7 8 0i&!ri !#are3 izo ro*e 90i&!ri#e I: - !on in a! ina;8 0i&!ri in ne!a e3 anizo ro*e 90i&!ri#e A: - !on in miozina &i *ar ia# a! ina. Di&!# !#ar e& e3 #a ran0# &a3 im*ar i in 0oa )emi0i&!ri 0e !a re %an0a Z3 iar 0i&!# in ne!a are in *ar ea !en ra#a %an0a H3 %i&e! a a 0e #inia M. In re 0oa mem%rane Z &!!e&i2e e& e 0e#imi a &ar!omer# - ni a ea morfofn! iona#a a mio$%ri#ei3 ! o #ngime 0e '3 mm &i forma 0in r-n 0i&!in ne!a =an!a 0e 0oa )emi0i&!ri !#are.
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