![]() At the same time, an electrical impulse is sent to the atrioventricular node ( AV node), located in the junction between the atrium and ventricle. This signal is transmitted to all the atrial muscle cells so that they can fire at the same time and pump blood from the atrium to the ventricle, the first half of a heartbeat. They act as the pacemaker for the heart by generating an electrical impulse 60 to 80 times per minute. The sinoatrial node (SA node) is a collection of special cells embedded in the heart muscle of the right atrium. The heart's electrical system allows this to happen, so that each chamber of the heart beats (contracts or squeezes) when it's supposed to. There needs to be a short delay to allow the ventricles to fill and then pump the blood back to the body and lungs to complete the cycle. The upper chambers of the heart, called the atria (single= atrium) collect blood from the body and lungs and pump it into the ventricles. The heart's electrical system allows the heart muscle to beat in a coordinated fashion to maximize the pumping strength of the ventricles, the lower chambers of the heart, and make certain that there is an adequate amount of blood to be pumped. The heart is a two-stage electrical pump whose function is to circulate blood to the organs and tissues of the body. ![]() Palpations are sensations by a person that they are having hard, rapid, or irregular heartbeats or a combination of these sensations.Ī brief description of the heart's function that should help readers to better understand palpitations. Sweating, nausea, and shortness of breath may accompany palpitations.
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