sinoatrial node

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Related to sinoatrial node: atrioventricular node, bundle of His

sinoatrial node

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]

sinoatrial node

(or SA node) Special cells in the heart wall, forming its natural pacemaker.

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Noun

sinoatrial node - a specialized bit of heart tissue that controls the heartbeat

cardiac pacemaker, SA node, pacemaker

cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction

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References in periodicals archive ?

Caption: The sinoatrial node (circled above) in your heart sends out electrical impulses that cause your heart to beat.

When A Slow Heart Rate Does--and Does Not--Require Attention: If a slow heartbeat causes no symptoms, there's often no cause for concern

Noma, "The sustained inward current and inward rectifier [K.sup.+] current in pacemaker cells dissociated from rat sinoatrial node," The Journal of Physiology, vol.

The Pattern of mRNA Expression Is Changed in Sinoatrial Node from Goto-Kakizaki Type 2 Diabetic Rat Heart

The artery of the sinoatrial node, anatomic considerations based on 45 injectiondissections of the heart.

A study on anatomy and variations of sinoatrial nodal artery

Citation: Stephanie I Protze et al., "Sinoatrial node cardiomyocytes derived from human pluripotent cells function as a biological pacemaker," Nature Biotechnology, 2016; DOI: 10.1038/nbt.3745

Scientists produce functional heart pacemaker cells

Exercise training-induced bradycardia: evidence for enhanced parasympathetic regulation without changes in intrinsic sinoatrial node function.

Association of exercise training and angiotensin-converting enzyme 2 activator improves baroreflex sensitivity of spontaneously hypertensive rats

The neural input to the heart consists of vagal efferents that innervate the sinoatrial node and the atrioventricular node.

Electrocardiographic changes during acute mental stress

To create biological pacemakers, one approach is to coax stem cells to become specialized cardiac pacemaker cells that are normally found within the sinoatrial node of the heart.

Stem Cell Tech for Biological Pacemakers?

The AV dissociation is separated into 2 subtypes: 1) the atria and ventricles beat independent of each other under the control of separate pacemaker foci, and 2) impulses from the sinoatrial node can occasionally be conducted to the ventricle during AV dissociation, causing ventricular capture and ventricular fusion complexes, termed as complete and incomplete AV dissociation, respectively.

Atrioventricular dissociation and congestive heart failure in a ring-necked pheasant (Phasianus colchicus)

The HF component measures the influence of the vagus nerve in modulating the sinoatrial node, whereas the LF component provides an index of sympathetic effects on the heart, and the LF/HF ratio indicates sympathovagal balance.

A cross-sectional study on effect of body mass index on the spectral analysis of heart rate variability

A reduction in HRV indicates an inability or attenuation in the autonomic nervous system's or sinoatrial node's responsiveness to change.

The voice of music resounding on HRV

Ivabradine is an oral drug that inhibits the If current ("funny" current) in the sinoatrial node, the body's cardiac pacemaker.

Amgen's ivabradine for the treatment of chronic heart failure (HF) has been granted priority review designation by the FDA. Ivabradine is an oral drug that inhibits the If current ("funny" current) in the sinoatrial node, the body's cardiac pacemaker

Called the sinoatrial node, it acts like a metronome to keep the heart pulsing at 60 to 100 beats a minute or so, more when you're active.