The ticker’s electrical system is the power source that makes it beat. The electrical impulse travels along a pathway in the heart and make the atria and the ventricles (the upper and lower chambers of the heart) work together to pump blood through the ticker. A normal heartbeat begins as a single electrical impulse that comes from the sinoatrial (SA) node, an electrical pulse is sent out by the impulse that causes contraction of the atria and move blood into the lower ventricles. The electrical current passes through the atrioventricular (AV) node (it is the electrical bridge between the atria and ventricles), causing the ventricles to squeeze and release in a steady, rhythmic sequence. The chambers draw blood into the ticker, as they squeeze and release, and push it back out to the rest of the body and lungs, which is what causes the pulse we feel on our wrist or neck. With Atrial Flutter (AFL), the electrical signal travels along a pathway within the right atrium and moves in ...