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MCAT Question A Day - 3/1/14

A countercurrent mechanism in the kidney helps maintain a high concentration of salt in the interstitial fluid of the medulla, the site adjacent to where the hypotonic filtrate passes before its elimination out of the body. This permits efficient

A.  secretion of excess salts.
B.  adjustment of filtrate pH.
C.  filtration of venous blood returning to the heart.