Conduction System of the Heart

Sinoatrial Node

Also known as the SA node, located in the right atrium wall, generates impulses 60 to 100 times per minute.

Sinoatrial Node

The 'Pacemaker' of the heart - sets the pace for the heart and determines heart rate, triggers the atria to contract and passes the impulse to the AV node.

Atrioventricular Node

Also known as the AV node, located between the atria and ventricles.

Atrioventricular Node

Causes a delay, allowing the atria to empty of blood and close the bicuspid and tricuspid valves, sends impulses to the AV bundle.

Atrioventricular Bundle

Located in the septum, also known as the AV bundle or bundle of His, sends impulses to the bundle branches.

Right & Left Bundle Branches

Right branch = right ventricle; Left branch = left ventricle; send impulses to the Purkinje fibers.

Purkinje Fibers

Spread through the ventricle muscle tissue, carries impulses through the ventricles and cause them to contract.