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Oh, Beating Heart: Your Life Sustaining Electrical System | VOICE
HEALTHY LIVING WITH DR. ERNEST LEVISTER F.A.C.P., F.A.C.P.M Your heart began to beat when you were a four week old fetus in the womb. Over the course of the average lifetime, it will beat over 2 billion times. The heart is composed of four chambers separated into two sides. The right side receives deoxygenated blood from the body and pumps it toward the lungs, where it picks up oxygen from the air you breathe. The oxygenated blood returns to the left side of the heart, where it is sent through the circulatory system, delivering oxygen and nutrients around the body. The pumping action of the heart is coordinated by muscular contractions that are generated by electrical currents. The atria (upper chambers) and ventricles (lower chambers) work together, alternately contracting and relaxing to pump blood through your heart. The electrical system of your heart is the power source that makes this impulses that travel down a special pathway through your heart: 1. SA node (sinoatrial node) –