Which renal tubule segment is normally impermeable to water while actively reabsorbing sodium, potassium and chloride?
Correct answer: B. Thick ascending limb
- A. Thin descending limb
- B. Thick ascending limb
- C. Proximal convoluted tubule
- D. Collecting duct with high ADH
Explanation
The thick ascending limb reabsorbs sodium, potassium and chloride but does not allow water to follow. This helps create the medullary concentration gradient used in urine concentration.
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About Urinary System
The urinary system includes the kidneys, ureters, urinary bladder and urethra, with emphasis on nephron structure and urine formation. It explains glomerular filtration, tubular reabsorption, tubular secretion, water and electrolyte regulation, acid base balance, and the roles of ADH and aldosterone in maintaining homeostasis.
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