NEET Biology question
Which of the following statements is/are true? I. Urine is hypertonic in distal convoluted tubule. II. When the urine passes into the collecting tubule, it becomes hypotonic. III. Urine is isotonic in proximal convoluted tubule. IV. Urine becomes more and more hypotonic as it passes through Henle's loop.
Answer: (C)
Solution
Statement I is false because the filtrate reaching the DCT has just left the water-impermeable, electrolyte-transporting ascending limb of Henle's loop and is hypotonic, not hypertonic (it is concentrated only later, in the collecting duct under ADH); statement II is true, since the filtrate is indeed hypotonic by the
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