alleryThe counter-current mechanism for urine concentration involves
AHenle's loop and vasa recta together
BPCT and DCT in cortical region
CBowman's capsule and Macula densa
DCollecting duct and calyceal system
Answer & Solution
Correct answer: A. Henle's loop and vasa recta together
Loop of Henle (filtrate counter-current) and vasa recta (blood counter-current) together maintain the osmotic gradient (~300 mOsm cortex to ~1200 mOsm inner medulla).
Water leaves the collecting duct to concentrate urine.
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