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Samenvatting Urinewegstelsel ()

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2020/2021 Written for academic year
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Anatomie en Fysiologie (Z55767)
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Anatomie en Fysiologie Thomas More Geel - Urinewegstelsel

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Anatomie en Fysiologie
Urinewegstelsel
Nieren
Functie: bloedzuivering
Doorbloeding van de nier
20% van het hartminuutvolume bloed naar nier (= 1L).
Nefron
= Microscopische structuren die doet aan bloedzuivering
Werking van de nier
- Ultrafiltratie
▪ Het filteren van urine
▪ Niet selectief werkt op grootte van deeltjes
- Terugresorptie
▪ Stoffen teruggebracht van het bloed via actief transport
- Excretie
= Bepaalde afvalstoffen worden afgegeven aan het nierkanaaltje
Regeling van de water- en zoutuitscheiding
Osmoregulatie= de juiste osmotische druk van het bloed
- Antidiuretisch hormoon (ADH)
▪ Geproduceerd door hypothalamus
▪ Afgegeven aan het bloed door neurohypofyse
▪ ↑ Zoutgehalte = ↑ ADH
▪ ↑ Doorlaatbaarheid
- Renine-angiotensine-aldosteronsysteem (RAAS)
▪ ↓ Bloeddruk = ↑ renine
▪ Omzetting van plasma eiwit angiotensinogeen (↑ bloeddruk)
 Vaatvernauwing van arteriolen dus perifere weerstand ↑
 Extra terugresorptie van water en NaCl
 Terugresorptie van Na en excretie van K
- Natriuretische peptiden
▪ ↑ Bloedvolume en ↑ bloeddruk worden natriuretische peptiden uitgescheden
Regeling van de zuurtegraad
Verzuring in het bloed voorkomen
- Uitademen
- Nieren scheiden H+-ionen uit
Aanmaak van erytrocyten
= Controle van de zuurstof in het bloed
↓ Zuurstof = ↑ erytropoëtine (OPE)

Urine
Verzamelbuizen → nierpapillen → nierkelken




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Connected book
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Ludo Gregoire, Agnes Straaten-Huygen Anatomie en fysiologie van de mens
Publisher: augustus 2014 ISBN: 9789006925630 Edition: 4

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Voedings En Dieetkunde
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Urinewegstelsel
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