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    Hi,

    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 ]
    DCT-Sodium-0.1
    CD-Sodium - 0.33
    DCTPotassium-0.06
    CDPotassium - 0.85
 
 
 
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