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Examples of sinoatrial node in a Sentence
Recent Examples on the Web
Each heartbeat starts with an electrical impulse fired by a cluster of cells (called the sinoatrial node) in the right atrium.
—Christopher Lee, Verywell Health, 25 Sep. 2024
One wire rests near the sinoatrial node, and the second in one of the heart’s ventricles.
—Virginia Singla, Discover Magazine, 15 Dec. 2023
The heart’s pulse rate can be higher than this number if the sinoatrial node initiates a heartbeat naturally.
—Virginia Singla, Discover Magazine, 15 Dec. 2023
Of the billions of cells in the human heart, a mere 10,000 pacemaker cells---collectively called the sinoatrial node---are responsible for sending the electrical pulse through the remaining heart cells.
—Breanna Draxler, Discover Magazine, 19 Dec. 2012
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Word History
First Known Use
1913, in the meaning defined above
Dictionary Entries Near sinoatrial node
Cite this Entry
“Sinoatrial node.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sinoatrial%20node. Accessed 21 Nov. 2024.
Medical Definition
sinoatrial node
noun
: a small mass of tissue that is made up of Purkinje fibers, ganglion cells, and nerve fibers, that is embedded in the musculature of the right atrium of higher vertebrates, and that originates the impulses stimulating the heartbeat
called also S-A node, sinus node
More from Merriam-Webster on sinoatrial node
Britannica.com: Encyclopedia article about sinoatrial node
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