Recent Examples on the WebOne 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
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'sinoatrial node.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
: 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
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