The heart’s job is to pump blood through your body. The heart’s electrical system triggers the heart to pump. The pulse or heartbeat is what you feel when the heart’s lower chambers, ventricles, push blood out of the heart through the blood vessels.
The normal heart beat is regular (no skipping), and has a rate between 60 to 100 beats per minute. When you rest your heart rate slows down, when you are active your heart rate goes up.
The heart’s electrical system
The electrical signal starts in the heart’s right upper chamber (the right atrium) at the sinus node (the heart’s natural pacemaker where electrical impulses originate) and then spreads to the other upper chamber (the left atrium). The signal is then collected at the center of the heart at the AV node. The AV node is the only electrical connection from the upper chambers (atria) to the lower chambers (ventricles) in the normal heart. From the AV node, the signal speeds along special nerves call the right and left bundle branches into the lower chambers (the ventricles). The electrical signal triggers the ventricles to pump blood to the body
Each part of this electrical system can wear out in human beings. When this occurs, a pacemaker is sometimes required. Pacemakers for the most part are used to treat slow heart rhythms. A pacemaker is a medical device that is made up of a “generator” and usually two “leads”. The generator contains the computer chip “the brain” and a battery. The generator creates an electrical signal when one is needed. To send the signal to the heart “leads” are used. Leads are wires that deliver the pacing signal to the upper and lower chambers of the heart.