ADH and the collecting ductSpec 7.20B
ADH is released by the pituitary gland. It controls how much water is reabsorbed in the kidney, which keeps the water content of the blood steady (osmoregulation). ADH changes the permeability of the collecting duct.
| Blood water content too low | Blood water content too high | |
|---|---|---|
| ADH released | More | Less |
| Collecting duct | More permeable to water | Less permeable to water |
| Water reabsorbed into blood | More | Less |
| Urine | Small volume, concentrated | Large volume, dilute |
| Blood water content | Rises back to normal | Falls back to normal |