Sodium potassium pump

How does this work?

There is a high concentration of K+ outside the cell but low inside and a high concentration of Na+ inside but low outside. The cell has to work against this gradient to get K+ in and Na+ out.

  1. 3Na+ molecules enter pump
  2. ATP attaches phosphate on protein pump and becomes ADP
  3. Pump changes shape
  4. 3Na+ released outside cell, 2K+ molecules enter pump
  5. Pump senses this, causing phosphate ion to detach from pump
  6. With phosphate gone, pump goes back to original shape
  7. 2K+ enter cell
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My teacher use to say salty banana. Na reminds u of salt and K reminds u of banana. Na is pumped outside and K is pumped inside to maintain the gradients.

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