Urine Concentration/Dilution Flashcards
function of recirculation of urea in the medulla
helps trap urea in the medulla, contributes to hyperosmolarity
what happens to your urine if you have a high protein diet
produce more urea, have more concentrated urine
where does reabsorbtion of sodium and chloride take place
thick loop of henle
what portion of the loop of henle is permeable to water
thin descending loop
what portion of loop of henle is impermeable to water
thick and thin ascending loop
where does countercurrent exahcnge take place
vasa recta
is countercurrent exchange an active or passive process?
passive
where does countercurrent multipliation take place
loop of henle
affect of ADH concentration on cortical collectind ducts
highest osmolarity possible is here.
affect of ADH concentration on medullary collecting deucts
urine becomes more concentrated
What does dehydration cause
increases the release of ADH, increases sympathetics, increases angiotension, decreases ANP
overhydration effects
increase ANP, decrease symphateics, Angiotension II, ADH
how does central diabetes affect ADH
can not make it at all
how does nephrogenic diaetes affect ADH
patients don’t have ADH receptors, or the needed type of aquaporin
Why does diabetes cause a large amount of dilute urine
because they are bypassing the medullary gradient that would normally remove water from the collecting ducts
