Q:

What is the effect of antidiuretic hormone on the kidney tubules

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What is the effect of antidiuretic hormone on the kidney tubules?


  1. It causes Na + to be absorbed from the fi ltrate into the tubular cells.
  2. t causes the concentration of urine to decrease
  3. It causes the fi ltrate volume to increase
  4. It causes the walls of the collecting duct to become permeable to water

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D: ADH causes more water channels (aquaporins) to be inserted in the wall of the collecting duct. Hence the duct is more permeable to water. 

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