Could any expert explain what a junctional rhythm is? thanks!

Junctional rhythm: The "AV junction" is a connection that the electrical signal passes through from the top of the heart to the bottom. It acts as a back-up pacemaker when the hearts normal pacemaker stops working. Thus, a Junctional rhythm is a back-up rhythm that keeps your heart beating. It's typically slower than normal and less responsive to activity. Many times an artificial pacemaker is required. See PCP.

Rhythm : Sinus rhythm means activation of heart beat is activated by natural pacemaker Junctions rhythm is activated lower from the middle of heart, a-v node or lower