Medicine Which of the following aquaporin water channels is located on apical membrane of principal cells of the collecting duct A Aquaporin 1 B Aquaporin 2 C Aquaporin 3 D Aquaporin 4 💡 Explanation Which of the following aquaporin water channels is located on apical membrane of principal cells of the collecting duct ✓ Correct Answer: B. Aquaporin 2