NEET Biology question
Which of the following statements is/are incorrect regarding the collecting duct? (i) It extends from the cortex to medulla (ii) Large amount of water could be reabsorbed by it to produce concentrated urine (iii) Small amount of urea diffuses into it from the medulla to keep up the osmolarity (iv) It plays a role in maintaining pH and ionic balance of blood by the selective secretion of H+ and K+ ions
Answer: (B)
Solution
Statements (i), (ii) and (iv) are all true descriptions of the collecting duct, but statement (iii) reverses the actual direction of urea movement — urea actually diffuses OUT of the
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