Renal 6 Flashcards
Where does water reabsorbtion occur
In the collecting duct
AVP secretion happens due to
Increased osmolarity
Decreased blood volume
Decreased Blood pressure
What creates the hyperosmotic onterestinium in medulla
Countercurrent exhange system
Urea
Countercurrent Exchnage system
to reduce heat loss
two parts of renal countercurrent exchange system
Countercurrent multiplier
Countercurrent exchanger
Loop of henle
Countercurrent multplier
Peritubular capillaries (Vasa recta)
Countercurrent exchanger
Countercurrent multiplier
the descending limb has a lot of aquaporin channels allowing water to follow its concentration gradient into the hyperosmotic interstitinum
The ascending henle limb of the loop actively trasports Na Cl and K into the interstitinum
What are responsible for the high osmolarity deep in meduula
Nephron and vasa recta of juxtamedullary nephrons
There is a ton of active transport
In the ascending limb
How does urea contribute to the osmolarity of the medullary interstitium
Creates a recycling loop
About half the solute in the meduula interstinium is urea
Increases Osmolarity (NaCl)
Vasopresson secreted and Thirst
Blood pressure goes up, ECF volume goes up
Where is more sodium excereted
Urine
Hormone for Sodium Balance
Renin Angiotensin aldosterone system
Where does this hormone target
Last third of the distal tubule and the portion of the collecting duct
