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Samenvatting Biologie H10 Voeding en vertering: overzicht verteringsstelsel

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de weg van mondholte naar endeldarm overzichtelijk beschreven

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H10 voeding en vertering: overzicht verteringsstelsel
Uploaded on
February 4, 2021
Number of pages
2
Written in
2020/2021
Type
Summary

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verteringsstelsel
onderdelen: functie: verteren van…
gebit oppervlakte van voedsel vergroten
mondholte
speekselklieren afgeven enzym amylase zetmeel  maltose
slijm als smeermiddel
huig neusholte afsluiten bij slikken
keelholte
strotklepje luchtpijp afsluiten bij slikken
slokdarm verplaatsen voedsel van keelholte naar maag met peristaltische bewegingen

tijdelijke opslag van voedsel

maag maagsapklieren produceren maagsap (water, zoutzuur, enzym pepsinogeen) eiwitten  aminozuurketens
pepsinogeen = inactieve vorm van enzym peptase

zoutzuur (pH 1,5 – 3,5)  bacteriën in voedsel doden

slijmwand beschermt maagwand tegen zure maagsap en peptase

maagportier kringspier die maag afsluit
afgifteplaats van: gal en alvleessap vermengen met voedselbrij

produceert gal
12-vingerige lever breekt rode bloedcellen aftot bilirubine
darm afbraak giftige stoffen (bijv. alcohol)
tijdelijke opslag van glucose als glycogeen

galblaas opslagplaats van gal  vetten emulgeren, zodat enzymen beter kunnen
inwerken op groot oppervlakte

alvleesklier maakt insuline en glucagon

produceert alvleessap met de enzymen: vetten  glycerol + 3 vetzuren
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