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The high osmolarity of the renal medulla...

The high osmolarity of the renal medulla is maintained by all of the following except -
I. Diffusion of salt from the ascending limb of the loop of Henle
II. Active transport of salt from the upper region of the ascending limb
III. The spatial arrangement of juxtamedullary nephrons
IV. Diffusion of urea from the collecting duct
V. Diffusion of salt from the descending limb of the loop of Henle

A

Only I

B

Only V

C

III and IV

D

I and IV

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