In which of the following areas of the nephron is the filtrate the LEAST concentrated assuming high levels of ADH are present?
A. distal convoluted tubule
B. at the end of the descending limb of the loop of Henle
C. at the end of the ascending limb of the loop of Henle
D. at the end of the proximal convoluted tubule
E. collecting duct
Ans: C. at the end of the ascending limb of the loop of Henle
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