Which of the following buffer pairs is considered the major plasma buffering system?
a. Protein/fat
b. Carbonic acid/bicarbonate
c. Sodium/potassium
d. Amylase/albumin
ANS: B
The carbonic acid/bicarbonate buffer pair operates in both the lung and the kidney and is a major extracellular buffer. Protein and fat are nutrients not related to the buffering system. Sodium and potassium are electrolytes for fluid and electrolyte balance, not the major plasma buffering sys-tem for acid-base balance. Amylase is a carbohydrate enzyme, and albumin is a protein; neither is a buffering system.
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