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SlideshowReport

Regulation of Water Reabsorption by ADH

Description
Facultative Reabsorption

Negative Feedback

Reabsorption in early DCT


Na+ - Cl– symporters reabsorb ions
PTH stimulates reabsorption of Ca2+
It also inhibits phosphate reabsorption in the PCT, enhancing its excretion

Late DCT and Collecting Duct

Principal Cells
   Na+-K+ pumps reabsorb Na+
   Aquaporin – 2 reabsorbs water
      Stimulated by ADH
Intercalated Cells
   Reabsorb K+ + HCO3–, secrete H+
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