What is the normal ratio of HCO3– to carbonic acid in healthy individuals?
a. 1:1
b. 2:1
c. 10:1
d. 20:1
ANS: D
The ratio of HCO3– to carbonic acid in healthy individuals is maintained near 20:1; this results in a pH of close to 7.40. HCO3– stores are evenly divided between intracellular and extracellular compartments.
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