NEET Zoology Urine Formation Multiple Correct Question
A comparison of the volume of the filtrate formed per day with that of the urine released (1.5 litres), suggest that nearly 99 per cent of the filtrate has to be reabsorbed by the renal tubules. Which statement true for reabsorption? (i) Nearly all of the essential nutrients, and 70-80 per cent of electrolytes and water are reabsorbed by this segment. (ii) Reabsorption in loop of Henle is minimum. (iii) Loop of Henle plays a significant role in the maintenance of high osmolarity of medullary interstitial fluid. (iv) The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes. (v) The ascending limb is impermeable to water but allows transport of electrolytes actively or passively. (vi) Conditional reabsorption of Na⁺ and water takes place in PCT. (vii) Large amounts of salt could be reabsorbed from collecting duct to produce a concentrated urine.
(i), (iv), (v), (vi) and (vii)
(i), (ii), (iii), (iv) and (v)
(ii), (iii), (iv) and (v)
(i), (ii), (iii), (iv) and (vii)
Correct Answer
Detailed Explanation
The proximal convoluted tubule (PCT) reabsorbs nearly all essential nutrients and a significant portion of electrolytes and water. The loop of Henle and collecting duct play crucial roles in urine concentration.
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