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How does heart beats?
The atria and ventricles work together, alternately contracting and relaxing to pump blood through our heart. The electrical system of our heart is the power source that makes this possible. Our heartbeat is triggered by electrical impulses that travel down a special pathway through our heart:

SA node (sinoatrial node) – known as the heart’s natural pacemaker.
    The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.
    The SA node sets the rate and rhythm of your heartbeat. Normal heart rhythm is often called normal sinus rhythm because the SA (sinus) node fires regularly.
 AV node (atrioventricular node)
    The AV node is a cluster of cells in the center of the heart between the atria and ventricles, and acts like a gate that slows the electrical signal before it enters the ventricles. This delay gives the atria time to contract before the ventricles do.
    His-Purkinje Network
    This pathway of fibers sends the impulse to the muscular walls of the ventricles and causes them to contract. This forces blood out of the heart to the lungs and body.
    The SA node fires another impulse and the cycle begins again.

At rest, a normal heart beats around 50 to 99 times a minute. Exercise, emotions, fever and some medications can cause our heart to beat faster, sometimes to well over 100 beats per minute.


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