In human nephrons, where does the majority of water, glucose, amino acids, and sodium ion reabsorption occur?
Answer and explanation
Correct answer: D. Proximal convoluted tubule (PCT)
- Step 1: The PCT reabsorbs approximately 65–70% of filtered water and sodium, and 100% of filtered glucose and amino acids under normal physiological conditions. Answer: Proximal convoluted tubule (PCT). Why not the others: Loop of Henle creates medullary concentration gradients; DCT/collecting ducts fine-tune under hormonal control.
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