Summary
Samenvatting spijsvertering
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samenvatting over spijsvertering
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SpijsverteringSpijsverteringskanaal:
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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