sinoatrial node
[ sahy-noh-ey-tree-uhl, sahy- ]
nounAnatomy.
a small mass of tissue in the right atrium functioning as pacemaker of the heart by giving rise to the electric impulses that initiate heart contractions.
Origin of sinoatrial node
1- Also called sinus node.
Words Nearby sinoatrial node
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Scientific definitions for sinoatrial node
sinoatrial node
[ sī′nō-ā′trē-əl ]
A small mass of specialized cardiac muscle fibers that acts as a pacemaker by initiating and maintaining normal heartbeat and cardiac rhythm. It is located in the right atrium.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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