Which of the following statements about the loop of Henle of juxtamedullary nephrons is correct?
a. The ascending limb is freely permeable to H2O and NaCl.
b. The filtrate is isotonic as it enters the loop, hypertonic at the tip of the loop, and hypotonic as it leaves the loop.
c. The descending limb actively transports NaCl out of the tubule into the interstitial fluid.
d. All of the above.
e. None of the above.
B
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