active + co-transport

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4 Terms

1
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active transport?

substance movement from area of low concentration to area of high concentration via ATP + a carrier protein

2
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process of active transport?

  • transport via carrier proteins in cell membrane

  • molecule binds to complimentary receptor on protein

  • ATP binds to protein + is hydrolysed into ADP + Pi

  • causing protein to change shape + release the molecule on the other side

  • Pi release + protein returns to original shape

3
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process of co-transport glucose/amino acids in the ileum?

  • Na+ actively transported out of epithelial cell into blood via carrier protein

  • reduces Na+ conc. in epithelial

  • Na+ diffuses (facilitated) from lumen into epithelial via co-transporter protein

  • glucose can attach + diffuse into epithelial too, against their conc. gradient

  • glucose conc. in epithelial > capillaries, so diffuses via facilitated diffusion into blood down its conc. gradient

4
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why is co-transport used to transport glucose/amino acids?

higher conc. of glucose in epithelial than in the lumen, so co-transport required