Week 12: The Urinary System 3 Flashcards
1
Q
What is the concentrating apactiy related to?
A
The thick medulla with long loop of Henle
2
Q
What drives water movement from the “last” tubule segment lumen to the interstitium (the collecting duct)?
A
3
Q
osmotically active substances should be removed from the tubular fluid in order to ↑ osmotic activity of the interstitial fluid of the medulla
(back to 1200 mOsm)
A
4
Q
Problems that are associated with concentration and dilution?
A
- active transport cannot work against high concentration gradient
- intensive cell metabolism cannot opperate in very high hyperosmotic environment (1200 mOsm urine should be formed)
- medullary circulation must not wash away osmotically active substances
5
Q
Circulation of the vasa recta operates as a ______
A
counter current exchanger
6
Q
A