sinoatrial node

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Related to Sinoatrial cell: sinoatrial node

sinoatrial node

n.
A small mass of specialized cardiac muscle fibers located in the posterior wall of the right atrium of the heart that acts as a pacemaker by generating at regular intervals the electric impulses of the heartbeat. Also called sinoauricular node, sinus node.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

si′no•a′tri•al node′

(ˈsaɪ noʊˈeɪ tri əl, ˌsaɪ-)

n.
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.
[1920–25; sin (us) + -o- + atrial]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

sinoatrial node

(or SA node) Special cells in the heart wall, forming its natural pacemaker.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.sinoatrial 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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The potential mechanisms include GLP-1-induced vasodilation leading to reflex tachycardia;[3] direct stimulation of the GLP-1 receptor on sinoatrial cells [4] and involvement of sympathetic nervous system activity.[5] This case represents, to the best of our knowledge, a very rare report of liraglutide-induced ECG change.
Shortening of the action potential of the sinoatrial cells and rapid diastolic depolarization favors sinus tachycardia.