________ is an arrhythmia in which there is a very fast but regular rhythm (250 beats per minute) of the atria or ventricles
A) Asystole
B) Fibrillation
C) Flutter
D) Murmur
C
Explanation: A) Asystole, the complete absence of a heartbeat, is not an arrhythmia.
B) Fibrillation is an arrhythmia, but it has an uncoordinated quivering, not have a regular rhythm.
C) Correct!
D) A murmur is an abnormal heart sound, not an arrhythmia.
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