EXCRETORY SYSTEM
KIDNEY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Reabsorption of useful substances from the filtrate begins at the
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Proximal tubule.
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Henle’s loop.
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Collecting duct.
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Bowman’s capsule.
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Explanation:
Detailed explanation-1: -Reabsorption of useful substances from glomerular filtrate occurs in proximal convoluted tubule (PCT). PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption.
Detailed explanation-2: -The proximal tubules reabsorb about 65% of water, sodium, potassium and chloride, 100% of glucose, 100% amino acids, and 85-90% of bicarbonate. This reabsorption occurs due to the presence of channels on the basolateral (facing the interstitium) and apical membranes (facing the tubular lumen).
Detailed explanation-3: -Glucose, amino acids, salts and high amount of water are reabsorbed in the nephron during the second step of urine formation, i.e., the selective reabsorption.
There is 1 question to complete.