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Samenvatting Spijsverteringsstelsel

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korte samenvatting over het spijsverteringsstelsel

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Uploaded on
March 21, 2016
Number of pages
4
Written in
2012/2013
Type
Summary

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Spijsvertering
Functie:
- Aanvoer van brand- en bouwstoffen voor het lichaam.

Voeding bestaat uit de volgende voedingsstoffen:
- Eiwitten
- Koolhydraten
- Vetten
- Water
- Zouten (mineralen)
- Vitaminen

Bouw spijsverteringskanaal:
 Mond en speekselklieren
 Keel(holte)
 Slokdarm
 Maag
 Dunnen darm
 Dikke darm
 Alvleesklier
 Lever en galblaas

Mond:
 Opname
 Fijnmaken
 Vermengen met speeksel
 Gelaatsuitdrukking
 Spraak
 Speeksel:
o Verteert zetmeel
o Verdunt


Keelholte:
 Kruising luchtweg en voedselweg
 Overgang willekeurig-onwillekeurig

Slokdarm:
 Vervoert de spijsbrij van de keel naar de maag door de borstkas door
middel van peristaltiek

, Maag:
 Opslag
 Afscheiding van maagsap
 Kneden en mengen met maagsap
 Kleine beetjes naar dunne darm
 Maagsap:
 Zoutzuur: doden bacteriën
 Slijm: bescherming
 Pepsine: eiwitsplitsend enzym
 Intrinsieke factor: nodig voor opname vit. B12

Dunnedarm:
 Onderdelen:
o Twaalfvingerige darm- duodenum
o Nuchtere darm- jejunum
o Kronkeldarm- ileum
 Functies:
o Transport(voedsel)
o Toevoegen gal, alvleeskliersap en darmsap
o Vertering
o Opname
o Doorgeven niet verteerde resten aan dikke darm

Verteringssappen:
 Dunne darmsap:
o Proteïnase: vertering eiwitten (aminozuren)
o Sacharidase: vertering koolhydraten
o Alvleeskliersap:
o Sacharidase(verteren voor koolhydraten)
o Proteïnase(verteren voor eiwitten)
o Lipase(verteerd vetten)
 Gal:
o Emulgeren(=kleiner maken) van vet

Dikke darm = colon
 Onderdelen:
o Blinde darm
o Karteldarm:
 Opstijgend deel, dwarse deel, afdalende deel, S-vormig deel
o Endeldarm (rectum)
 Endeldarmopening (anus)
Functies:
o Indikking
o Vorming (door bacteriën) en opname van vitamines(vitamine K)
o Transport en uitscheiding (ontlasting)
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