Reabsorption of water by countercurrent multiplier mechanism takes place at:
Correct answer: D. Loop of Henle
- A. Proximal Tubule
- B. Distal Tubule
- C. Collecting Duct
- D. Loop of Henle
Explanation
The interstitial fluid of kidney is gradually concentrated from cortical to medullary part ,thus inner medulla is highly concentrated with the presence of urea and through a mechanism called counter current multiplier. This mechanism causes gradual osmotic outflow of water from filtrate back to kidney as it passes downward in the descending loop of henle. Hence option D is right.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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