ANATOMY

Detailed explanation-1: -The atrioventricular node delays the SA node’s electrical signal. It delays the signal by a consistent amount of time (a fraction of a second) each time. The delay ensures that your atria are empty of blood before the contraction stops. The atria are the heart’s upper chambers.

Detailed explanation-2: -The heart’s intrinsic pacemaker, the sinoatrial node (SAN), generates spontaneous action potentials (AP) through a system of coupled oscillators whose common output initiates each normal heartbeat.

Detailed explanation-3: -An important aspect of AV node conduction is to introduce a delay between atrial and ventricular excitation to allow time for atrial contraction to complete filling of the ventricles.

Detailed explanation-4: -AV Node Delay. CLASS, a SMALLER nodal cell DIAMETER leads to a slighly slower conduction of the electrical signal. How is this delay beneficial to the heart? It gives the atria just a little more time to eject as much blood as possible into the ventricles.