Given below are two statements:
Statement I: Concentrated urine is formed due to counter current mechanism in nephron.
Statement II: Counter current mechanism helps to maintain osmotic gradient in the medullary interstitium.
In the light of the above statements, choose the most appropriate answer from the options given below:
1. Statement I is correct but Statement II is incorrect.
2. Statement I is incorrect but Statement II is correct.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.
Subtopic:  Concentration of Urine |
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Which of the following factors is responsible for the formation of concentrated urine?

1. Hydrostatic pressure during glomerular filtration.
2. Low levels of antidiuretic hormone.
3. Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.
4. Secretion of erythropoietin by Juxtaglomerular complex.
Subtopic:  Concentration of Urine: I | Concentration of Urine: II | Concentration of Urine |
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