Control of the heartbeat and ECGs Quiz
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5 questions, one answer each
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1. Which structure delays the impulse before it reaches the ventricles?
- A. AVN
- B. SAN
- C. Bundle of His
- D. Purkyne fibres
2. What does the QRS complex on an ECG represent?
- A. Atrial depolarisation
- B. Ventricular repolarisation
- C. Ventricular depolarisation
- D. Atrial repolarisation
3. The R-R interval on an ECG is 0.60 s. What is the heart rate?
- A. 60 beats per minute
- B. 80 beats per minute
- C. 120 beats per minute
- D. 100 beats per minute
4. Which statement is correct about the heart?
- A. It needs nerve impulses to start each beat
- B. It is myogenic, so the SAN starts each beat
- C. It is neurogenic, with the AVN as pacemaker
- D. The ventricles contract before the atria
5. An ECG shows no distinct P waves and irregular R-R intervals. Which is the most likely condition?
- A. Bradycardia
- B. Normal sinus rhythm
- C. Heart block with regular rhythm
- D. Atrial fibrillation