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Sagot :
The presence of dense microvilli in the epithelial cells of the proximal convoluted tubule enhances their ability to reabsorb substances from the filtrate. This structure is also called brush border epithelium.
What is tubular reabsorption?
The movement of water and solutes from the proximal convoluted tubule back into the bloodstream is called tubular reabsorption.
Water and solutes from the proximal convoluted tubule (PCT) are transported to the bloodstream in bulk and thus most of the reabsorption occurs via the PCT.
These tubules reabsorb about 60% of water and 90% of bicarbonate. They also reabsorb almost 100% of the glucose and amino acids.
This reabsorption takes place by two routes. First is the paracellular route in which solutes move between cells via the intracellular route. Second is the transcellular route in which solutes move through the cells.
Therefore, the structural modification helping the proximal convoluted tubule cells to enhance their ability to reabsorb substances from filtrate is the presence of microvilli.
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