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SA node - Übersetzung nach arabisch
![lumen]]. Cardiac muscle cells of the right atrium can be seen to the left of the node, and fat tissue to the right.](https://commons.wikimedia.org/wiki/Special:FilePath/Sinoatrial node 2 low mag.jpg?width=200 "lumen]]. Cardiac muscle cells of the right atrium can be seen to the left of the node, and fat tissue to the right.")
Definition
Wikipedia
The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells. The sinus node is approximately 15 mm long, 3 mm wide, and 1 mm thick, located directly below and to the side of the superior vena cava.
These cells can produce an electrical impulse known as a cardiac action potential that travels through the electrical conduction system of the heart, causing it to contract. In a healthy heart, the SA node continuously produces action potentials, setting the rhythm of the heart (sinus rhythm), and so is known as the heart's natural pacemaker. The rate of action potentials produced (and therefore the heart rate) is influenced by the nerves that supply it.
