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Samenvatting Histologie - Vetweefsel

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Samenvatting van hoofdstuk vetweefsel uit cytologie en histologie. Extra info uit les en notities zijn verwerkt. Kan van pas komen bij examen!

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H5 vetweefsel
Uploaded on
February 7, 2020
Number of pages
3
Written in
2019/2020
Type
Summary

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Vetweefsel

 Bijzondere vorm bindweefsel: vetcellen (=adipocyten) overheersen
 Geïsoleerd of in groepen
 Zeer metabool actief – endocrien weefsel
 Adipokines vrijstellen
 Functie
o Energiereservoir
o Stootkussen
o Isolatie (slechte warmtegeleider)

 Nerveus en hormonaal (adrenaline en cortisol) beïnvloed

 Classificatie

o Wit of univacuolair vetweefsel: grote centrale druppel
- Wit tot donkergeel (carotenoïden)
- Meest voorkomend
- GER; golgi!, RER (vetmetabolisme; enzymproductie); mitochon,
peroxisomen (voor zuurstofradicalen grijpen)
- Overal in lichaam (onder huid) behalve: oogleden, penis, scrotum en oorlel
- Afh van leeftijd: herverdeling => gereguleerd door geslachtshormonen
(prog- E2- testo) en Adrenocorticotroop hormoon (regelt vetophoping)
- B3 receptoren: beta-adrenergen (binding (nor)adrenaline verhoogt lipolyse => meer vrije VZ
in circulatie


Histologische sructuur

- Grote vacuole met vet, errond dun laagje cytoplasma (zegelringcellen)
- Golgi, lange en eivormige mitochondrieen, weinig RER en vrije ribosomen
- Vele pinocytoseblaasjes
- Verdeling in lobben door bindweefselschotten (bloedvaten en
zenuwenp
- Rond vetcel: reticulaire vezels (steun + verbinding)


Histogenese
o Ontstaan uit lipoblast (mesenchymale cel)
o Uit mesoderm
o Opp vergroten
o Vetten opslaan: eerst aan ene pool zichtbaar, dan aan andere
o Fusie vetdruppels (alles naar 1 pool)
o Ontstaan nieuwe vetcellen: net na geboorte en net voor puberteit
o Meerdere vetcellen: plurivacuolair stadium is niet gelijk aan
plurivacuolaire cel
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