In which part of the renal tubule does the majority (approximately 65-70%) of water, sodium, and nutrients get reabsorbed?
Answer and explanation
Correct answer: A. Proximal Convoluted Tubule
- Step 1: The PCT is lined with simple cuboidal brush-border epithelium featuring extensive microvilli. Step 2. It reabsorbs 100% of filtered glucose and amino acids and 65-70% of Na+, Cl-, and water back into peritubular capillaries. Answer: Proximal Convoluted Tubule (PCT). Why not the others: Loop of Henle reabsorbs ~20% and concentrates medullary interstitium; DCT reabsorbs ~5% under hormonal control; Collecting duct reabsorbs under ADH.
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