During a nerve impulse, sodium ions move into the axon while potassium ions move out. At rest, the axon is more negatively charged inside compared to outside. During the resting state, the axon maintains higher concentrations of sodium ions outside and potassium ions inside, with chloride ions also higher outside and organic anions inside.

1. the axon

2. the axon During a nerve impulse…….

3. the axon During a nerve impulse……. Na + moves in

4. the axon During a nerve impulse……. Na + moves in K+ moves out

5. the axon At rest……. more negative

6. the axon At rest……. more negative less negative

7. the axon During a nerve impulse……. positive negative … for a brief period of time only!

8. the axon During the resting state……. Lots of Na + out here

9. the axon During the resting state……. Lots of Na + out here but not much K +

10. the axon During the resting state……. Lots of Na + out here but not much K + Lots of K+ in here but not much Na+

11. the axon During the resting state……. Lots of Na + out here but not much K + Lots of K+ in here but not much Na+ Lots of Cl - out here

12. the axon During the resting state……. Lots of Na + out here but not much K + Lots of K+ in here but not much Na+ Lots of Cl - out here Not much Cl - in here

13. the axon During the resting state……. Lots of Na + out here but not much K + Lots of K+ in here but not much Na+ Lots of Cl - out here Not much Cl - in here Lots of negative organic ions here

14. the axon During the resting state……. Lots of Na + out here but not much K + Lots of K+ in here but not much Na+ Lots of Cl - out here Not much Cl - in here Lots of negative organic ions here NO negative organic ions here!