transmitting an impulse - action potential and hyperpolarisation

The axon is now depolarised polarised repolarised( depolarised, polarised, repolarised )

During repolarisation depolarisation( repolarisation, depolarisation ), the sodium potassium( sodium, potassium ) gated channels close and the sodium permeability returns to its usual low high( low, high ) state

potassium sodium( potassium, sodium ) gated channels open close( open, close ) and potassium ions move out of the axon down the electrochemical gradient and potassium concentration gradient, attracted repelled( attracted, repelled ) by the negative charge outside of the axon.

The membrane is highly not highly( highly, not highly ) permeable to potassium ions at this stage so too many few( many, few ) move out of the cell. This makes the potassium gated channels close and the potassium diffuse back into out of( into, out of ) the axon in order to restore the resting potential. If there has been a build up of sodium inside the cell due to many successive action potentials then the sodium-potassium pumps magical forces( sodium-potassium pumps, magical forces ) start working once more.