EXCRETORY SYSTEM
KIDNEY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Glucose is reabsorbed into the capillaries surrounding the first convulated tubule. The cells lining the inside of the tubule at this point have:
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protein pumps and many mitochondria for active transport
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extra thick cell membranes to prevent damage from urea
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microvilli to increase the surface area:volume ration
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have sieve plates to help filter out unwanted materials
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Explanation:
Detailed explanation-1: -The proximal tubule normally reabsorbs 100% of filtered glucose, amino acids, and small peptides. On the apical surface, this movement is due to Na+-coupled cotransport.
Detailed explanation-2: -Most of the glucose entering the tubular system is reabsorbed along the nephron segments, primarily in the proximal tubule, such that urine is almost free of glucose.
Detailed explanation-3: -The kidneys reabsorb filtered glucose through the sodium‐glucose cotransporters sodium‐glucose cotransporter (SGLT) 1 and SGLT2, which are localized on the brush border membrane of the early proximal tubule with immune detection of their expression in the tubularized Bowman capsule.
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