The high osmolarity of the renal medulla is maintained by all of the following except (i) Active transport of salt from the upper region of the ascend

The high osmolarity of the renal medulla is maintained by all of the following except (i) Active transport of salt from the upper region of the ascend
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The high osmolarity of the renal medulla is maintained by all of the following except (i) Active transport of salt ... v C. ii and iii D. iv and v
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