renall

• all tight junctions are more easily traversed by cations
• lumen negativity ((generated by Na+ reabsorption)) is a constant phenomenon at the DCT and CCD

DCT: 5% filtered volume

principal cells ((K+ secretion))
alpha-intercalated cells ((H+ secretion))
beta-intercalated cells are capable of secreting bicarb and reabsorbing protons.

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