By Levi Clancy for Student Reader on
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.