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Samenvatting spijsvertering

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samenvatting over spijsvertering

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Uploaded on
January 16, 2024
Number of pages
3
Written in
2023/2024
Type
Summary

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Spijsvertering

Spijsverteringskanaal:
 Spijsverteringskanaal is een holle verbindingsweg tussen mondholte en anus, totale
lengte 8 cm.
 Doel spijsvertering; systematisch afbreken door enzymen van voedingsbestand
delen, zodat ze opgenomen kunnen worden door het bloed.


Functie:
 Smaak
 Gebit en kauwspieren malen voedsel
 3 speekselklieren 1. Oorspeekselklier
2. Onderkaakspeekselklier
3. Ondertongspeekselklier
 Speekselklieren verdunnen voedsel en beginnen met verteren koolhydraten m.b.v.
amylase.

Slokdarm= oesophagus
 Transporteren voedsel m.b.v. peristaltiek
 Onwillekeurige spieren in de wand van slokdarm trekken zich achter voedsel samen,
voor voedsel verslappen

Maag= gaster of ventriculus
Maagmond= cardia
Functie:
 Opslaan voedsel en water
 Kneden en mengen met maagsap
 Eiwitten verteren met pepsine
 Vitamine B12 opname door stof intrinsic factor
 Maagsap bevat zoutzuur en pepsine
 Maagmond; afsluiten maag

Maagdoorsnee:
 Binnenzijde in plooien dikke slijmvlieslaag
Afscheiding van:
1. Slijm
2. Maagsappen o.a. zoutzuur en enzymen

 Naar buiten toe, lengte- als rondom lopende spierlagen
 Uitgang maag(portier)= pylorus

Dunne darm= intestinum tenue
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