The main function of the loop of Henle is to
- A. establish a salt gradient in the medulla that allows urine to be concentrated
- B. filter the blood
- C. secrete hormones
- D. store urine before release
Explanation
By pumping salt out of its ascending limb, the loop builds a concentrated medulla that draws water out of the collecting duct. The longer the loop, the more concentrated the urine, which is why desert mammals have such long ones.
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