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What is going on in the proximal tubule?
- active transport of: NaCl (out), H+ (in), nutrients (out)
- passive transport of: water (out), NH3 (in), K+ (out), HCO3- (out)
What is going on in the distal tubule?
active transport of: NaCl (out), H+ (in), K+ (in), HCO3- (out)
What is happening in the descending limb?
passive transport of water out
What is happening in the thin limb of the ascending?
passive transport of NaCl out
What is happening in the thick limb of the ascending?
active transport of NaCl out
What is happening in the collecting duct?
- passive transport out of H2O and urea
- active transport out of NaCl
i. Define the countercurrent multiplier
1. countercurrent multiplier: the long loops of Henle of the juxtamedulalry nephron + collecting ducts; it multiplies the osmolarity of the medullary interstitial fluid
i. Define the countercurrent exchanger
1. the countercurrent exchanger is the vasarecta; it removes water from the medullary interstitial fluid, taking it back into the blood
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