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Which of the following factors is responsible for the formation of concentrated urine?

1. Low levels of antidiuretic hormone.
2. Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.
3. Secretion of erythropoietin by juxtaglomerular complex.
4. Hydrostatic pressure during glomerular filtration.

Correct answer: Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.

Solution

The kidney concentrates urine by creating and maintaining a hyperosmotic medullary interstitium, which drives water reabsorption from the collecting ducts. Low ADH would reduce water reabsorption, while erythropoietin and glomerular hydrostatic pressure are not the key mechanism for urine concentration.

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