This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Active resorption of sodium ion occurs in: March 2008 
Select and explain. 
A. Ascending loop of henle, B. Early distal tubule, C. Proximal tubule, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. D: All of the above About 65% of the filtered electrolytes are absorbed in PCT actively Thin ascending loop of Henle: Passive diffusion of sodium Thick ascending loop of Henle: Active transpoation of sodium Early distal tubule: Similar propeies as that of thick ascending loop of Henle