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By generating electrical impulses.

By: isamar
The individual cells in a heart actually can beat on their own without any nervous stimulus. However, the cells have to beat together to have a heart that functions the right way. There is a conduction system in the heart made of specialized heart cells that make the rhythm. There are two main "nodes" called the SA node and AV node. The SA node starts the beat. The AV node is a sort of back up for the SA node. There are other special heart cells that made up of special fibers that transmits the signal through out the walls of the heart.

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Q: What initiates the heartbeat?
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