Question
Distinguish between Selective reabsorption and Tubular secretion.
| No. | Selective rcabsorption | Tubular secretion |
| $i.$ | Selective reabsorption is concerned with the selective absorption of useful substances from the glomerular filtrate. | Tubular secretion is transfer of materials from peritubular capillaries to the renal tubular lumen. |
| $ii.$ | Substances with considerable importance (high threshold) like – glucose, amino acids, vitamin $C, Ca^{++}, K^+, Na^+, Cl^–$ are absorbed actively, against concentration gradient | In this process, substances like urea. amino acids, glucose, pigments, and inorganic ions arc removed from the blood and discharged along with the urine. |
| $iii.$ | Selective reabsorption occurs in Proximal convoluted tubule, Henle’s loop, Distal convoluted tubule and collecting duct. | Tubular secretion occurs in Distal convoluted tubules only. |
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