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ADH (anti-diuretic hormone, vasopressin) acts to:

ADecrease water reabsorption (more urine output)
BDecrease Na+ reabsorption (more urine output)
CIncrease water reabsorption (less, concentrated urine)
DIncrease urea production rate by liver tissue
Answer & Solution
Correct answer: C. Increase water reabsorption (less, concentrated urine)
ADH (vasopressin), from posterior pituitary, INCREASES WATER REABSORPTION in collecting ducts (inserts aquaporins). **Result:** less urine, more concentrated urine. Released when body is dehydrated.
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