ECOLOGY
EXCRETORY PRODUCTS AND THEIR ELIMINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Loop of Henle
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Proximal convoluted tubule
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Distal convoluted tubule
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Collecting tubule
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Detailed explanation-1: -The proximal convoluted tubule avidly reabsorbs filtered glucose into the peritubular capillaries so that it is all reabsorbed by the end of the proximal tubule. The mechanism for glucose reabsorption was described in Chapter 7.4. The proximal tubule is the only site for glucose reabsorption.
Detailed explanation-2: -Under normal circumstances, up to 180 g/day of glucose is filtered by the renal glomerulus and virtually all of it is subsequently reabsorbed in the proximal convoluted tubule.
Detailed explanation-3: -The proximal tubules reabsorb about 65% of water, sodium, potassium and chloride, 100% of glucose, 100% amino acids, and 85-90% of bicarbonate.
Detailed explanation-4: -Firstly, the glucose in the proximal tubule is co-transported with sodium ions into the proximal convoluted tubule walls via the SGLT2 cotransporter.
Detailed explanation-5: -Glucose is absorbed in the proximal convoluted tubule (PCT) which is one of the tubules present in Nephron. Their epithelial cells consist of luminal brush border cells. They are densely covered with microvilli and hence they increase the absorptions.