The following table gives an idea of the intra and extra cellular ion concentrations in a squid axon and a mammalian cell;
Extracellular and intracellular ion
concentration
|
Concentration (mM) |
|
Ion |
Intracellular |
Extracellular |
Squid Axon |
||
K+ |
400 |
10 |
Na+ |
50 |
440 |
Cl- |
40-150 |
560 |
Ca++ |
0.0001 |
10 |
Mammalian cell |
||
K+ |
140 |
5 |
Na+ |
5-15 |
145 |
Cl- |
4 |
110 |
Ca++ |
0.0001 |
2.5-5 |