Which choice describes the countercurrent mechanism of the nephron loop?
A. Water moves into the ascending limb; sodium moves out of the ascending limb
B. Water moves out of the descending limb; sodium moves out of the ascending limb
C. Water moves into the descending limb; sodium moves out of the descending limb
D. Water moves out of the ascending limb; sodium moves into the ascending limb
Answer: B
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