1. Transmission of nerve impulses

2. axon

3. During a nerve impulse
Na+
axon

4. During a nerve impulse
K+ Na+
axon

5. Resting state
More positive – outside
axon
Less positive - inside

6. During an action potential
Na+
axon
Less positive - inside

7. During an action potential
Na+
axon
Inside becomes DEPOLARISED

8. During an action potential
Na+
axon
Inside becomes DEPOLARISED
Action potential is generated