Which of the following mechanisms helps to eliminate excess H+ via the kidneys? 1. Reabsorption of HCO3– 2. Phosphate buffering 3. Ammonia buffering

a. 2 and 3 only
b. 1 and 3 only
c. 2 only
d. 1, 2, and 3


ANS: D
After all available HCO3– ions react with H+ ions, the remaining H+ ions react with two other fil-trate buffers, phosphate and ammonia, as illustrated in Figures 13-4 and 13-5.

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