Which organ system maintains the normal level of HCO3– at 24 mEq/L?
a. Liver
b. Lung
c. Renal
d. Spleen
ANS: C
Normally, the kidneys maintain an arterial bicarbonate concentration of approximately 24 mEq/L, whereas lung ventilation maintains an arterial PCO2 of approximately 40 mm Hg.
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