ADH (vasopressin) acts on the kidney to
Aincrease Na⁺ excretion
Bincrease water reabsorption in the collecting duct
Cdecrease blood pressure
Dproduce more dilute urine
Answer & Solution
Correct answer: B. increase water reabsorption in the collecting duct
ADH makes the collecting duct more permeable to water → more water reabsorbed → concentrated urine. Released when blood is too concentrated.
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