ECOLOGY
EXCRETORY PRODUCTS AND THEIR ELIMINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the proximal (first) convoluted tubule
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In the distal (second) convoluted tubule
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In the collecting duct
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None of the above
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Detailed explanation-1: -In the nephron, selective reabsorption occurs in the proximal convoluted tubule because it is highly permeable.
Detailed explanation-2: -Selective reabsorption takes place in the proximal convoluted tubule (PCT) of the kidney. It is the process by which certain substances that are required by the body (such as glucose, amino acids, vitamins and water) but have been filtered out of the blood during ultrafiltration, are reabsorbed.
Detailed explanation-3: -Selective reabsorbtion occurs in the PCT (proximal convoluted tubule). The PCT is highly permeable meaning it is easy for molecules to diffuse through it.
Detailed explanation-4: -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-5: -Proximal tubules are responsible for reabsorbing approximately 65% of filtered load and most, if not all, of filtered amino acids, glucose, solutes, and low molecular weight proteins. Proximal tubules also play a key role in regulating acid-base balance by reabsorbing approximately 80% of filtered bicarbonate.