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8/2/2019 Organizarea Structural A a Citoplasmei Celulei Eucariote
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ORGANIZAREA STRUCTURALA ACITOPLASMEI CELULEI
EUCARIOTE
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Hialoplasma
Se mai numeste substanta fundamentala acitoplasmei, matrice citoplasmica,citosolIn microscopia optica clasica este o masaomogena optic, nestructurataMicroscopia electronica evidentiaza diferentieristructurale specifice,organitele si reteauatridimensionala a citoscheletuluiEste un biocoloid ce contine85%apa,macromolecule organice si ioniSe caracterizeaza prin tranzitia sol-gel si estesediul metabolismului celular
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C itoscheletul este constituit din:Microfilamente de actinaMicrotubuli
Filamentele intermediareReteaua de microtrabecule-structuracontroversata
si proteinele asociate.
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Microtubulii
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Caracteristicile microtubulilor
Uniformitatea constitutivaPolaritateaInstabilitatea dinamicaPrezenta de proteine asociate
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P olimerizareatubulinelor
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Microtubul citoplasmic
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F unctiile microtubulilor
Miscarea organitelor sau curentiicitoplasmaticiTransportul axonalMiscarea cililor si flagelilor Fusul de diviziune
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Interactiunea tubulina- kinesina
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Transportul veziculelor (dineina si kinesina)
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S ectiune prin flagel
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APARATUL MI TOT IC ES T E C ON S T I TU I T DI N:
POLII FUSULUI DE DIVIZIUNEMICROTUBULII FUSULUI DE DIVIZIUNECINETOCORI
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Centrosomul
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C entriolul
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Celula in metafaza
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C elula din epiteliu pulmonar in anafaza
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Actina la microscop electronic
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A ctina si miozina in muschiul striat
structura sarcomerului
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Interactiunea miozinei cu filamentul de
actina in procesul contractiei musculare
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Muschiul cardiac
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A ctina si miozina in celula endoteliala
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S tructura microvililor
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F ilamentele intermediare
Au 5 monomeri constitutivi:Vimentina
DesminaNeurofilamenteleProteina gliala fibrilara acida
CitocheratineleSunt formate din 8 protofilamente,cu caracter apolar
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Monomerii filamentelor intermediare
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Lamina nucleara formata dinlaminele A,B,C
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V imentina-actina F
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V imentina-tubuline
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K eratina in celule epiteliale
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K eratina