Which of the following statements regarding renal handling of Na+ is correct?
A. In the absence of aldosterone, Na+ will be secreted by the cortical collecting ducts.
B. In the proximal tubule, Na+ is actively transported across the luminal membrane of the tubular epithelial cells.
C. Atrial natriuretic factor increases Na+ reabsorption.
D. Na+ is actively reabsorbed in the ascending limb of the loop of Henle.
E. Without vasopressin, the collecting duct is impermeable to Na+.
Answer: D
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