Sodium/Potassium PumpComments
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Sodium/Potassium Pump

The Sodium/Potassium Pump puts Na+ outside the cell and K+ inside the cell.

  • 3Na+ mols inside bind to receptor
  • This stimulates phosphorylation of receptor by ATP.
  • This alters receptor shape, shape change dumps Na+ onto inside.
  • Open receptors bind 2K+ ions outside.
  • K+ binding triggers phosphate release.
  • This restores original conformation.
  • K+ released inside, NA+ sites become available.
  • Net: 1 ATP lost; 3 Na+ outside; 2 K+ inside.