Muscular II 2016

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    ! Tesutul muscular striat

    scheletic

    !

    Tesutul muscular striatcardiac

    ! Tesutul muscular

    neted

    Tesutul muscular I.

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    Tesutul muscular striat: domenii special

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    Fusurile neuro-musculare I.

    - Receptori de tip senzorial, localizatiprintre fibrele musculare

    - Fiecare fus format din 8-10 celulefoarte alungite, modificate, denumite

    fibre intrafuzale, inconjurate de spatiulperiaxial, care contine un fluid; acestansamblu este inconjurat de o capsula

    - 2 tipuri de fibre intrafuzale: cu nuclei incosulet, mai numeroase si cu nucleiinsirati (in lant); in jur: celule muscularenemodificate, denumite extrafuzale;

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    Fusurile neuro-musculare II.

    - Filete nervoase senzoriale formeaza

    terminatii anulo-spirale (sau primare), injurul portiunii centrale a fibrelor fuzale(adaptare rapida) si terminatii nervoasesecundare (adaptare lenta).

    - Filete motorii, eferente, !, se terminape niste placi motorii la nivelul fibrelorintrafuzale;

    - Fibrele extrafuzale isi primescterminatiile nervoase normale (eferentemotorii ");

    Intindere -> distorsiune a filetelorsenzoriale ->informatii la fibrele motorii->

    contractie

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    ! Tesutul muscular striat

    cardiac

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    Celulele atriale

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    Celulele atriale! granule secretorii!

    Palade 1961! Jamieson & Palade,

    1964! forma sferica 500 nm! 1981 A. de Bold, factor

    natriuretic atrial! produce: diureza,

    natriureza, kaliureza,scade TA;! eliberarea consecinta

    cresterii volumului

    sang. circulantSunday, January 10, 16

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    Sistemul excito conducator

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    Sistemul excito-conducator! celule P, T si Purkinje (toate, celule nodale)!

    celule P:! nod SA si AV; forma rotunda, citoplasma clara,nucleu central, foarte mare;

    ! sarcolema fara tubi T;

    ! aparat contractil slab dezvoltat; miofibrile putine;!jonctiuni tip desmozomal intre ele sau cu celulele T! functie de pace-maker

    !

    celule T:! sarcolema fara tubi T; forma intermediara intre

    celulele P si miocardocite! rol: raspandirea impulsului cu originea in cel. P

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    Sistemul excito conducator

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    Sistemul excito-conducator! celule Purkinje :

    !

    cel. mai mari decat miocardul lucrator! MO citoplasma clara, la periferie un inel de fibrile

    ! 1-2 nuclei dispusi central! ME: miofilamente aranjate in miofibrile dispuse

    separat, putin numeroase, cu orientare paralela cuaxul lung al celulei;

    ! Mitocondrii numeroase, prientate la intamplare

    ! RS slab dezvoltat! caracteristica absenta tubilor T

    !jonctiunile dintre fibrele Purkinje sunt de tip gap si

    desmozomal; lipsesc discurile intercalare.Sunday, January 10, 16

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    Comparatie intre cele doua tipuri decelule musculare

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