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Ionic concentration outside and inside the neuron [7]
| Ion | Outside (mM) | Inside (mM) | Outside : Inside |
|---|---|---|---|
| K+ | 5 | 100 | 1 : 20 |
| Na+ | 150 | 15 | 10 : 1 |
| Ca2+ | 2 | 0.0002 | 10000 : 1 |
| Cl– | 150 | 13 | 11.5 : 1 |
These differences of ionic concentration provide a state of the rest potential in which ion currents can be generated by opening ion channels when needed.
