A patient is told they have 'atrial fibrillation.' Which statement best describes this condition?

A patient is told they have 'atrial

Multiple choice — select the best answer

AThe ventricles beat too slowly
BThe SA node fires too rapidly and regularly
CChaotic electrical activity in the atria causing an irregular heartbeat
DThe AV node is completely blocked

✓ Correct answer: C. Chaotic electrical activity in the atria causing an irregular heartbeat In atrial fibrillation, multiple ectopic foci fire chaotically in the atria, producing an irregularly irregular ventricular response. The AV node acts as a partial gatekeeper, but rhythm and rate are unpredictable.

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Topic: Body Systems

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