HOSA Dental Terminology Practice

What is fibrillation?

1. A rapid contraction of the heart muscle

2. Local quivering of muscle fibers

3. A rhythmic heart beat

4. Complete cessation of heart activity

The correct answer is: Local quivering of muscle fibers

Fibrillation refers to local quivering of muscle fibers, particularly in the context of the heart. When the heart muscle undergoes fibrillation, it can lead to an irregular and disorganized heartbeat, meaning the muscle fibers contract in a chaotic manner rather than in a coordinated rhythmic way. This can result in ineffective pumping of blood and can pose serious health risks. The option regarding a rapid contraction of the heart muscle typically describes tachycardia, a different cardiac condition characterized by an abnormally fast heart rate. A rhythmic heartbeat suggests a normal functioning of the heart, which is opposed to the chaotic nature of fibrillation. The complete cessation of heart activity is known as cardiac arrest, which is another distinct condition. Understanding these differences is crucial in recognizing the implications of fibrillation and its impact on cardiovascular health.