"The AV node receives electrical signals from the sinoatrial (SA) node and delays their passage (by ~120–200 milliseconds) before transmitting them to the ventricles 2,3. This delay allows the atria time to contract and fully empty into the ventricles before ventricular contraction begins 2,3. The AV node also acts as a backup pacemaker in the case of SA node dysfunction (at a slower rate of 40-60 bpm) 2,3."
"The AV node receives electrical signals from the sinoatrial (SA) node and delays their passage (by ~120–200 milliseconds) before transmitting them to the ventricles 2,3. This delay allows the atria time to contract and fully empty into the ventricles before ventricular contraction begins 2,3. The AV node also acts as a backup pacemaker in the case of SA node dysfunction (at a slower rate of 40-60 bpm) 2,3."