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Practice MCAT Question - Q139

The rapid reabsorption of water brought about by ADH is made easier by the “countercurrent multiplier,” which involves the active transport of salts at the ascending loop of Henle. What is the result of this countercurrent multiplier effect?

A.  The filtrate becomes hypotonic while the surrounding tissues become hypertonic.
B.  The filtrate becomes hypertonic while the surrounding tissues become hypotonic.
C.  The filtrate becomes isotonic to the surrounding tissues.
D.  The tissues become isotonic to the filtrate.

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