selective reabsorption

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Last updated 3:53 PM on 5/24/26
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6 Terms

1
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what is reabsorbed?

  • useful products such as glucose/amino acids.

  • urea/water/ions


2
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where does it occur

  • proximal convoluted tubules


3
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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.


5
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3) reabsorption


  • useful substance (e.g glucose) is diffused into the blood.


6
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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