SA node

A form of sinoatrial node — A group of cells located in the wall of the right atrium of the heart that originates the impulses stimulating the heartbeat.

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pacemakercardiac pacemakersinoatrial node
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Meanings

nounSA node (plural SA nodes)

plural SA nodes

  1. abbreviationanatomyAbbreviation of sinoatrial node.

Synonyms & antonyms

nouna specialized bit of heart tissue that controls the heartbeat

Similar
pacemakercardiac pacemakersinoatrial node
Broader
cardiac muscleheart muscle
Also see
pacemakersinoatrial node

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

SA node. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/SA%20node

MLA

“SA node.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/SA%20node. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “SA node,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/SA%20node.

Source: SA node on Wiktionary, CC BY-SA 4.0.