Answer:
inner medulla; cortex
Explanation:
Loop of Henle is a U shaped tubular structure present in the nephron which is known to maintain a concentration gradient in the nephron.
The loop of Henle is present below the proximal tubule which is present in the renal cortex and loop is located in the renal medulla of the kidney.
The loop of Henle creates high concentration gradient in the inner medulla due to which water is reabsorbed in the descending tubule. The ascending limb is permeable to ions but impermeable to water which leads to low concentration gradient in the cortex.
Thus, inner medulla; cortex is correct.
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