____________ is a rapid heart rate in which the contractions are uncoordinated.

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Fibrillation is a rapid, irregular heartbeat in which the heart's contractions are uncoordinated. It can occur in the atria (atrial fibrillation) or ventricles (ventricular fibrillation) and can be life-threatening. Heart flutter (A) also refers to an irregular heartbeat but is generally slower and more organized than fibrillation. Tachycardia (C) refers to a rapid heartbeat but does not necessarily involve uncoordinated contractions. Bradycardia (D) refers to a slow heartbeat.

____________ Is a Rapid Heart Rate in Which the Contractions