Exam 3: Lecture 37 Flashcards
In which segments of the nephron is urea not transported?
TAL, DT, cortical and outer medullary CD
How much urea is reabsorbed in the PT?
50%
Which segment is urea secreted into the tubular fluid?
Thin descending limb
Within the inner medullary CT, how does ADH affect urea reabsorption?
ADH activates UT1 and urea is reabsorbed
If there is a decrease in ADH within the inner medullary CT, what is the effect of urea reabsorption?
It decreases
If ADH increases, what is the affect in the early CD?
Increased water absorption
What is the major action ADH has on mTAL?
Increases the activity of Na/K/2Cl cotransporter
What is the effect of ADH on principal cells in the late distal tubule?
Increase water reabsorption via V2 receptor - helps make concentrated urine
What is the effect of ADH on the inner medullary collecting ducts?
Increase urea transporter-1
Why is osmolarity of the filtrate identical to blood along the PCT?
Isosmotic reabsorption
Which type of cell in the late DT can reabsorb water in hyperosmotic urine?
Principal cells
What is needed for the principal cells to reabsorb water in the CD in hyperosmotic urine?
ADH
In the nephron, where does ADH increase transport (reabsorption) of urea?
Inner medullary collecting duct (tubule)
In hypo-osmotic urine production which sections of the nephron are now impermeable to water?
Late DT and CD
What are the four characteristics of mammalian urine?
- Urine color
- Urine odor
- Urine consistency
- Urine nitrogen
