A Level Biology Practice Exam

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What condition does atrial fibrillation describe?

  1. The ventricles beating too slowly

  2. An abnormal rhythm when the atria beat very fast and incompletely

  3. A form of heart block

  4. The heart not being able to contract properly

The correct answer is: An abnormal rhythm when the atria beat very fast and incompletely

Atrial fibrillation is characterized by an abnormal rhythm that occurs when the atria, the upper chambers of the heart, beat very rapidly and ineffectively. This results in disorganized electrical activity within the atria, leading to a lack of coordinated contraction. As a consequence, the atria may quiver instead of contracting fully, which can reduce the efficiency of blood flow into the ventricles. This can lead to various complications, including an increased risk of stroke and heart failure. Thus, the description of an abnormal rhythm where the atria beat very fast and incompletely accurately captures the essence of atrial fibrillation.

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