I'm struggling with answering a few kidney-related questions.
I would be grateful if someone could explain me or give me some hints why:
-after leaving the Bowman’s capsule, the concentration of sodium ions remains unchanged but the concentration of urea increases in the proximal convoluted tubule?
-(with references to the processes in the nepfron), the concentration of urea is so great in the collecting duct comparing to its concentration in the Bowman's capsule?
I also have to explain the changes in the concentration of sodium ions and potassium ions in the distal convoluted tubule and collecting duct.
distal convoluted tubule(DCT)/ collecting duct (CD) [ g/dm-3 ]
CD-Sodium - 0.33
CDPotassium - 0.85
But we haven't even met!