If the blood PCO2 is high, the kidneys will do which of the following?
a. Excrete more H+ and reabsorb more HCO3–.
b. Excrete less H+ and reabsorb more HCO3–.
c. Excrete less H+ and reabsorb less HCO3–.
d. Excrete more H+ and reabsorb less HCO3–.
ANS: A
If the blood PCO2 is high, creating high levels of H2CO3, then the kidneys excrete greater amounts of H+ and reabsorb all of the tubule filtrate's HCO3– back into the blood.
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