how a resting potential is maintained in a neurone.

• Sodium ions are actively transported out of the neurone and potassium ions are transported in by the sodium ion-potassium ion pump protein
• For every 3 sodium ions actively transported out, 2 potassium ions are transported in
• The membrane is more permeable to potassium ions leaving than to sodium ions entering
• The membrane is less permeable to sodium ions entering than to potassium ions leaving
• Permeability can be explained by the different numbers of leak channel proteins
• There is a higher concentration of potassium ions inside the neurone and a higher concentration of sodium ions outside the neurone
• Potassium ions diffuse out through leak channel proteins
• Sodium ions diffuse in through leak channel proteins