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Biology
Excretory Products and their Elimination
60 questions from 34 papers, each with its answer.
- 60 questions
- 34 papers
- 1.7% of Biology
Hormonal regulation of urine formation
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Diuresis is prevented by:Vasopressin (ADH), released from the neurohypophysis (posterior pituitary), increases water reabsorption from the later parts of the renal tubules, thereby concentrating urine and preventing excessive loss of water (diuresis).
Counter current mechanism and urine concentration
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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.The counter current flow of filtrate through the loop of Henle and blood through the vasa recta helps maintain an increasing osmolarity towards the inner medullary interstitium, and this counter current mechanism is what enables the formation of concentrated urine. Both statements are correct.
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