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Which of the following statements is fal...

Which of the following statements is false regarding the collecting duct?
I. Collecting duct is a straight duct
II. It extends from the cortex to medulla
III. Large amount of water could be reabsorbed from it to produce concentrated urine
IV. Small amount of urea diffuses out from it into the medulla to keep up the osmolarity
V. It plays a role to maintain pH and ionic balance of blood by the selective secretion of `H^(+)andK^(+)` ions

A

Only I

B

Only III

C

IV and V

D

None

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