Answer: Raising water permeability of the distal tubule and collecting duct.
- A Stimulating renin release from nearby juxtaglomerular cells
- B Raising glomerular filtration rate to filter more blood plasma
- C Raising water permeability of the distal tubule and collecting duct
- D Blocking sodium reabsorption within the proximal tubule
Correct answer: C. Raising water permeability of the distal tubule and collecting duct
Explanation: ADH increases water permeability of the distal convoluted tubule and collecting duct by promoting insertion of aquaporin channels, allowing more water reabsorption and concentrated urine formation.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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