‘Heart block’ is a disease which can result in a lower than normal heart rate. A doctor treating a patient suffering from heart block found that electrical impulses were initiated as normal but were not correctly conducted to the ventricles, so the rate of ventricular contraction was slowed.
Which may be functioning incorrectly in the patient?
1 atrioventricular node (AVN)
2 Purkyne tissue
3 sinoatrial node (SAN)
1 and 2 only
2 )
1 and 3 only
3 )
2 and 3 only
4 )
3 only
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