This lesson contains 98 slides, with interactive quizzes, text slides and 4 videos.
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Per minuut stroomt er ruim 1 liter bloed door de nieren via deze weg:
hart -> aorta -> nierslagader -> kleinere nierslagadertjes -> Glomerulus (= haarvaten in de functionele niereenheden) -> kleinere nieradertjes -> nierader
-> onderste holle -> hart
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Nier is opgebouwd uit vier duidelijk te onderscheiden onderdelen:
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In het nefron wordt urine gevormd
1. Ultrafiltratie in glomerulus
= zuivering van het bloed -> vorming van voorurine (180 L)
2. Terugresorptie van bruikbare stoffen terug naar het bloed in tubulus
3. Excretie van afvalstoffen via de urine
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Oiv bloeddruk wordt het bloedplasma uit glomerulus in het kapsel van Bowman geperst (filtraat) = Ultrafiltratie
Vocht in kapsel van Bowman
= voorurine
Bevat: water - glucose - aminozuren - opgeloste zouten - afvalstoffen
Bevat geen: grote bloedeiwitten - bloedcellen - bloedplaatjes
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Elke dag produceer je ± 180 L voorurine
Na terugresorptie blijft er maar 1% voorurine over = 1,5 - 2 L urine
Dat is ongeveer:
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