‘Heart block’ is a disease that can lead to a heart rate that is lower than normal. A doctor treating a person with heart block discovered that electrical impulses were initiated normally but were not conducted correctly to the ventricles, so the rate of ventricular contraction was slowed. Which parts may not be functioning correctly in the person with heart block?
- A1 and 2
- B1 and 3
- C2 and 3
- D3 only