The numerator of the Henderson-Hasselbalch (H-H) equation (HCO3–) relates to which of the following?
a. Blood concentration of nonbicarbonate buffers
b. Excretion of volatile acid by the lungs
c. Renal buffering and excretion of fixed acids
d. Respiratory component of acid-base bal-ance
ANS: C
Because the kidneys control blood [HCO3–] and the lungs control blood CO2 levels, the H-H equation can be conceptually rewritten as follows:
PH ∝ kidneys/lungs.
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