Final answer:
Junctional rhythm and sinus bradycardia both have a slower heart rate compared to normal sinus rhythm.
Step-by-step explanation:
When arrhythmias become a chronic problem, the heart maintains a junctional rhythm, which originates in the AV node. Sinus bradycardia is a heart rate that is too slow, below 60 beats per minute. In both junctional rhythm and sinus bradycardia, the heart beats at a slower rate compared to normal sinus rhythm, although the underlying causes and mechanisms may differ.