Ammonia in the kidney tubules is excreted in exchange for______________?
Correct answer: A. Na+
- A. Na+
- B. HCO3-
- C. CL-
- D. PO4-2
Explanation
In the proximal tubule, NH4⁺ can substitute for H⁺ on the Na⁺/H⁺ exchanger, allowing ammonia-derived acid to be secreted while Na⁺ is reabsorbed. This is why Na⁺ is the intended exchange partner among the listed options.
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