Multiple choice

Bradycardia is caused when

  1. heart beat exceeds 100 per minute

  2. heart beat is reduced to less than 60 per minute

  3. heart beat exceeds 80 per minute

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Bradycardia is defined as a heart rate of fewer than 60 beats per minute in adults. This can be normal in well-trained athletes during rest, but may indicate issues with the heart's electrical conduction system in other individuals. Options A and C incorrectly describe tachycardia (elevated heart rate), not bradycardia.