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Samenvatting Fundament 2 verpleegkunde: Bio: Lymfestelsel

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Samenvatting van geziene leerstof over lymfestelsel. vak biomedische fundament 2 van verpleegkunde in Leuven.

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Lymfestelsel
Uploaded on
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Lymfestelsel
1. Inleiding
Lymfecapillairen: verzamelen lymfe t.h.v. weefsels → lymfevaten: voeren lymfe af via lymfeklieren
naar bloedbaan (subclavia)

1.1 Functies
– Productie, onderhoud en transport van lymfocyten & macrofagen (afweersysteem: verdediging
tegen ziekteverwekkers, toxines, afwijkende lichaamseigen cellen op verschillende strategische
plaatsen in ons lichaam)
– Transport van weefselvocht: weefsels → bloed
– Transport van hormonen, voedingsstoffen en afvalstoffen: plaats van opname in weefsels →
bloed
NB: lymfe van de darm is vetrijk en wordt chyl genoemd

2. Samenstelling en ontstaan
LYMFE: weefselvocht, interstitieel vocht, extracellulair vocht

= Eiwitarm plasmafiltraat: water, zouten, voedings- en afvalstoffen

= Vocht dat doorheen poriën van haarvaten wordt geperst o.i.v. bloeddruk

− 85% van lymfe: in haarvaten heropgenomen → bloedbaan o.i.v. osmotische aantrekkingskracht
van plasma-eiwitten
− 15% van lymfe: afgevoerd door lymfecapillairen en teruggebracht naar bloedbaan
Ziektekiemen, toxines, kankercellen uit weefsels transporteren → lymfeklieren




3. Lymfevaten
Lymfecapillairen: verzamelen lymfe t.h.v. weefsels → lymfevaten:
voeren lymfe af via lymfeklieren naar bloedbaan (subclavia):

Ductus lymphaticus dexter: rechter arm, borsthelft, hoofdhelft, halshelft → rechter v. subclavia

Ductus thoracicus: rest van lichaam → linker v. subclavia




1

, 4. Lymfoïd weefsel
= Losmazig bindweefsel rijk aan lymfocyten & macrofagen (witte bloedcellen)

4.1 Primair lymfoïd weefsel
Vorming van B- en T- lymfocyten

4.1.1 Rood beenmerg
Vorming van B-lymfocyten

Stamcellen in rood beenmerg → ongedifferentieerde lymfocyten → in beemerg verwerkt tot B-cellen




4.1.2 Thymus (zwezerik)
Vorming van T-lymfocyten, voorste mediastinum, achter borstbeen, bovenop hart, 2 tal lobben




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