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The Sinoatrial node (SA node) is the impulse generating (pacemaker) tissue located in the right atrium of the heart, and thus the generator of sinus rhythm. It is a group of cells positioned on the wall of the right atrium, near the entrance of the superior vena cava.[1] In other words, the SA node initiates the heartbeat.

References

  1. various (n.d.). Sinoatrial node. Wikipedia. Retrieved on 2008-09-29.

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