First off, know that your heartbeat is mechanically controlled. A node in your body called the SA node (Sinoatrial node) starts the whole process of giving you beats. The SA node is also called the...
I believe it is called the Pace maker (not sure if it's one word or two). From what I it emits an electric pulse down the center of the heart, or septum, and causes the heart to contract. I do not...