BOTH A question in arrhythmia

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Hi, i'm 3rd year and I have a question about arrhythmia, we studied that arrhythmia could be as a result of disturbance in Automaticity / Excitability / Conductibility.
As I know, Disturbance in auto. could be Sinus bradycardia and sinus tachycardia.
Disturbance in conduct. = AV bock( types)
but about excitability, I understood that there is Extra systole and Reentry
i got that examples of extra systole is Atrial extra systole or vent. or atriovent.
and example of reentry is Atrial flutter or fib.
am I right? I mean, is it correct that disturbance in excitability could be extra systole and reentry as i wrote above? or I didnt understand what I read :\
thank u alot

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[worldbeater]

Your question is really vague, you will get an answer from somebody if you write out something more clear.