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Heart Electrical System with in how it works

Understanding the Heart's Electrical System:

Our heart has its own internal electrical system that controls the rate and rhythm of our heartbeat. With each heartbeat, an electrical signal spreads from the top of our heart to the bottom. As the signal travels, it causes the heart to contract and pump blood. Each electrical signal normally begins in a group of cells called the sinus node or sinoatrial (SA) node. As the signal spreads from the top of the heart to the bottom, it coordinates the timing of heart cell activity.

First, the heart's two upper chambers, the atria contract. This contraction pumps blood into the heart's two lower chambers, the ventricles. The ventricles then contract and pump blood to the rest of the body. The combined contraction of the atria and ventricles is a heartbeat.

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