What is the kidneys' most important function?
a. Acid-base balance
b. Chloride maintenance
c. HCO3– maintenance
d. Sodium maintenance
ANS: D
The kidneys' main job is to reabsorb sodium, not excrete it. For this reason, and because sodium has a major role in maintaining fluid balance, the kidney places a greater priority on reabsorbing Na+ than on maintaining Cl–, K+, or acid-base balance.
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