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Electrical signals travel through your heart
The muscular pumping action of your heart is triggered by electrical signals which are sent through the heart's electrical system to the heart muscle telling it when to contract and relax.
The electrical signal starts in the right atrium where your heart's natural 'pacemaker', called the sino–atrial node, is situated. This signal crosses the atria, making them contract. Blood is then pumped through the valves into the ventricles.
Where the atria meet the ventricles there is an area of special cells, called the atrio-ventricular node.
These cells act as a 'junction box' and pass the electrical signals throughout your heart muscle by a system of electrical pathways, known as the conducting system.
This makes the muscles of the ventricles contract. Blood is then pumped through the pulmonary and aortic valves into the main arteries.
The 'pacemaker' produces another electrical signal and the cycle starts again.
Normally your heart will beat between 60 - 80 times per minute. This regular rhythmic beating is dependent upon electrical signals being conducted throughout your whole heart.
If the electrical signals within your heart are interrupted, or disturbed, your heart can beat too quickly (tachycardia), too slowly (bradycardia) and / or in an irregular way. This is called an arrhythmia.