sinoatrial in English

noun
1
a small body of specialized muscle tissue in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular intervals.
noun

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1. Atrioventricular node definition, a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the Atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as pacemaker of the heart

2. Because the sinoatrial node is responsible for the rest of the heart's electrical activity, it is sometimes called the primary pacemaker.

3. 16 There is this specially adapted system of muscle and nerve tissue in the heart—the sinoatrial (SA) node, the atrioventricular node, and the Purkinje fibers—which sets the rhythm of the heart.