text: The<unk>  is composed of four phases: phase 0 is depolarization, phase 1 is early repolarization, phase 2 is a plateau, phase 3 is rapid repolarization and phase 4 is the resting potential.  The different phases depend on the opening and/or closure of specific ion channels.
option_0: Ventricular action potential
option_1: Polarization density
option_2: QRS complex
option_3: RR interval
option_4: QT interval
option_5: Resting potential
option_6: PR interval
option_7: Membrane potential