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What does the term "Bradycardia" describe?

  1. Fast heart rate

  2. Absence of heart rate

  3. Normal heart rate

  4. Slow heart rate

The correct answer is: Slow heart rate

Bradycardia describes a condition where the heart rate is slower than normal. This is not to be confused with tachycardia, which is a fast heart rate. An absence of heart rate would indicate cardiac arrest, which is a life-threatening condition. Thus, B is incorrect. C is also incorrect as it describes a normal heart rate, not a slow one. Overall, D is the best answer as it accurately defines bradycardia.