In the renal tubules, where is the Na+/K+ pump located?
A) in both the apical and basolateral membranes of principal cells
B) in the basolateral membrane of the proximal tubules
C) in both the apical and basolateral membranes of intercalated cells
D) in the apical membrane of the collecting ducts
E) in the apical membrane of the descending limb of the loop of Henle
Answer: B) in the basolateral membrane of the proximal tubules
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