Which of the following is important in renal excretion of hydrogen ion ?
Correct answer: D. Trapping H+ by NH3+
- A. Combining H+ with Cl- to form Hcl
- B. Combining H+ and HCO3- via enzyme carbonic anhydrase
- C. Trapping H+ by acetate
- D. Trapping H+ by NH3+
Explanation
Tubular ammonia accepts secreted H+ to form NH4+, trapping hydrogen ions in the urine and allowing their excretion. Option d appears to intend NH3, since NH3+ is not the usual chemical form involved.
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