EXCRETORY SYSTEM
COLLECTING TUBULE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Collecting duct
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Ascending limb of the nephron loop
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PCT
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DCT
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Detailed explanation-1: -Most of the reabsorption (65%) occurs in the proximal tubule . In the latter part it is favored by an electrochemical driving force, but initially it needs the cotransporter SGLT and the Na-H antiporter.
Detailed explanation-2: -The main function of the PCT is to reabsorb water and solutes like sodium, which is continuously pumped into the interstitium to create a gradient that allows many other solutes and even water to be reabsorbed by tubule cells.
Detailed explanation-3: -About 67 percent of the water, Na+, and K+ entering the nephron is reabsorbed in the PCT and returned to the circulation. Almost 100 percent of glucose, amino acids, and other organic substances such as vitamins are normally recovered here.