What is the term for the abnormal quivering of cardiac muscle fibers?

• A. Ventricular tachycardia
• B. Fibrillation
• C. Atrial flutter
• D. Myocardial infarction

Answer: (B)

The term for the abnormal quivering of cardiac muscle fibers is fibrillation. This condition occurs when the heart's electrical signals become chaotic, leading to ineffective contraction of the heart muscle, which can result in poor blood circulation. In the case of fibrillation, the heart does not pump blood effectively, causing a significant alteration in its function.

Fibrillation can occur in various parts of the heart, primarily the atria or ventricles. Atrial fibrillation features rapid and irregular heartbeats originating in the atria, while ventricular fibrillation is a more dangerous condition that affects the ventricles and can lead to sudden cardiac arrest if not treated immediately. Understanding this term is crucial for recognizing the critical nature of the heart's electrical system and its role in maintaining effective circulation in the body.