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samenvatting urinair stelsel

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  • September 20, 2022
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  • 2022/2023
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Samenvatting HC: urinair stelsel

Functies:

1. Excretie, verwijdering van organische afvalstoffen uit de lichaamsvloeistoffen

2. Eliminatie van de afvalstoffen via de urine

3. Homeostatische regeling van volume en concentratie van opgeloste stoffen in het
bloedplasma

Onderdelen:




 2 nieren (rechter & linker): produceren urine
 Deze worden bevloeid vanuit aorta: arteria renalis van
rechts
en links bevloeien de aorta
 Veneuze afvloei gebeurt via de vena renalis
naar de vena cava inferior
 Geproduceerde urine gaat via de ureter of urineleider
(heb je rechts & links)
 Ureter komt uit in vesica urinae of urineblaas
= tijdelijke opslag van urine
 Zo wordt de urine uiteindelijk afgevoerd via de urethra
of
plasbuis




Andere belangrijke homeostatische functies:

1. Regulatie van het bloedvolume en bloeddruk (hormonen die een rol spelen: volume H2O,
erythropoëtine, renine)

2. Regulatie van de concentratie van Natrium, Kalium, Chloride en andere ionen

3. Stabilisatie van de pH van bloed (evenwicht H+ - HCO3-)
Normale waarde = 7,4

4. Behoud van waardevolle voedingsstoffen




1

, Samenvatting HC: urinair stelsel



Anatomie/positie van
de nier


- bevinden zich
diep achteraan in de
buik
= retroperitoneum
(hierin liggen ook vena
cava en aorta  geven
vena en arteria renalis
af)
- dan gaan ze
de ureter aflopen
richting de urineblaas (ligt vlak achter het schaambeen)
- dan monden we uit in de urethra




Bouw van de nier




2

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