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| 9696460975 | threshold | the level of depolarisation required to cause an increase in Na+ permeability (pNa). Beyond this point the action potential is an 'all-or-none' event. | 0 | |
| 9696465767 | overshoot | the inside of the neurone becomes +ve to the outside, as the system is driven towards ENa | 1 | |
| 9696469142 | resting potential | is dictated mainly by K+ | 2 | |
| 9696472751 | falling phase | he switch from high pNa to high pK allows the driving forces causing K+ exit (+ve potential inside and concentration gradient) to come into play | 3 | |
| 9696475654 | undershoot | the system is driven towards Ek, before returning to its resting state | 4 | |
| 9696520653 | Rising phase | the rapid depolarisation occurs as the large driving forces causing Na+ entry (-ve potential inside and concentration gradient) come into play | 5 |
