Describe phases of ventricular A.P.
Phase 4 - iK1 (voltage-gated K channels) are open
Phase 0 - Fast Na channels open due to depolarization, Na rushes in
Phase 1 - Brief repolarization due to closing of Na channels, Ito1 (voltage-gated K channel) opens briefly
- Phase 2 - Plateau
- iK1 plugged with Mg++
- iCa (voltage-gated Ca channel) opens slowly, Ca enters cell
- Phase 3 - Repolarization
- iCa closes
- K channels open