selective reabsorption
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Last updated 6:55 PM on 1/26/26
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6 Terms
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what is reabsorbed?
useful products such as glucose/amino acids.
urea/water/ions
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where does it occur
proximal convoluted tubules
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1) Na diffusion
sodium diffuses out of epithelial cells into blood.
lowers Na conc in cells.
4
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2) co-transport
facilitated diffusion using carrier protein.
diffuses Na from PCT fluid into epithelial along with useful substance.
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3) reabsorption
useful substance (e.g glucose) is diffused into the blood.
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epithelial cells adaptations
infoldings: increase surface area for transfer of molecules into blood.
microvilli: increase surface area for reabsorption of molecules.
many mitochondria: ATP for active transport
Note 
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