Action potential Taxonomic distribution and evolutionary advantages Comparison of action potentials (APs) from a representative cross-section of animals

| Animal | Cell_type | Resting_potential_mV | AP_increase_mV | AP_duration_ms | Conduction_speed_m_s |
|---|---|---|---|---|---|
| Squid (Loligo) | Giant axon | −60 | 120 | 0.75 | 35 |
| Earthworm (Lumbricus) | Median giant fiber | −70 | 100 | 1.0 | 30 |
| Cockroach (Periplaneta) | Giant fiber | −70 | 80–104 | 0.4 | 10 |
| Frog (Rana) | Sciatic nerve axon | −60 to −80 | 110–130 | 1.0 | 7–30 |
| Cat (Felis) | Spinal motor neuron | −55 to −80 | 80–110 | 1–1.5 | 30–120 |