AIIMS 2017 Biology Urine Formation MCQ Question
Which of the following process of urine formation takes place all along the renal tubule and collecting duct?
Ultrafiltration and tubular secretion
Tubular reabsorption and secretion
Anti-current mechanism and reabsorption
Tubular reabsorption and secretion
Correct Answer
Detailed Explanation
The anti-current mechanism refers to the countercurrent multiplier system in the nephron, specifically in the loop of Henle, which aids in the reabsorption of H₂O and solutes, maintaining osmotic balance. While tubular reabsorption and secretion occur throughout the renal tubule and collecting duct, the anti-current mechanism is a specific process that enhances the concentration of urine by facilitating the reabsorption of H₂O and Na⁺. Option A is incorrect because ultrafiltration occurs only at the glomerulus, and option B, while partially correct, does not specify the unique role of the anti-current mechanism. Option D is misleading as it does not highlight the specific mechanism involved in urine concentration.
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