SA node

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Related to SA node: AV node
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.SA node - a specialized bit of heart tissue that controls the heartbeat
cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction
References in periodicals archive ?
The SA node releases an impulse of depolarization (electricity) that is conducted through both the right and left atrium, causing them to contract.
To prevent anarchy in the heart's electrical system, the pacemaker in the right atrium, the SA node, drives the show Specialized conductive tissue transmits impulses initiated at the SA node to the AV node near the ventricle and then throughout the heart muscle.