Proximal renal tubule is most permeable to _______________?
Correct answer: D. Sodium
- A. Ammonia
- B. Potassium
- C. Bicarbonate
- D. Sodium
Explanation
The proximal tubule has high permeability to sodium and reabsorbs most of the filtered sodium load, mainly through active transport and sodium-linked cotransport. Bicarbonate is also extensively reabsorbed, but sodium is the principal bulk solute handled here.
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