What is the limiting factor for H+ excretion in the renal tubules?
a. Excessive amounts of Cl–
b. Excessive amounts of HCO3–
c. Insufficient buffers
d. Insufficient sodium
ANS: C
When filtrate pH falls to 4.5, H+ secretion stops. Buffers in the tubular fluid are essential for the secretion and elimination of excess H+ ions in acidotic states.
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