Describe the sodium-potassium ion pump on cell plasma membranes (2 marks)

These pumps use ATP / active transport to move 3 sodium ions (Na⁺) out of the cell for every two potassium ions (K⁺) that move in.1 mark - idea of active transport / use of ATP1 mark - idea of 3 Na⁺ and 2K⁺ AND sodium ions moving in and potassium ions moving out