Sinoatrial node

E431115

biological pacemaker cardiac conduction system component cluster of specialized cardiomyocytes

The sinoatrial node is the heart’s natural pacemaker, a specialized cluster of cells that initiates and regulates the heartbeat by generating electrical impulses.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (2)

Label	Occurrences
sinoatrial node	2
Sinoatrial node canonical	1

How this entity was disambiguated

This entity first appeared as the object of triple T4332162 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Sinoatrial node
Context triple: [Heart, hasPart, Sinoatrial node]

A. Einthoven triangle
The Einthoven triangle is a conceptual model in electrocardiography that represents the heart’s electrical activity using three limb leads arranged as an equilateral triangle around the torso.
B. Takic branch
The Takic branch is a subgroup of the Uto-Aztecan language family comprising several closely related Indigenous languages of Southern California.
C. Einthoven
Einthoven is a Dutch surname most notably associated with Willem Einthoven, the Nobel Prize–winning physiologist who invented the electrocardiogram (ECG).
D. Human Heart
"Human Heart" is a solo studio album by Iranian-Canadian musical theatre actor and singer Ramin Karimloo, showcasing his blend of theatrical and contemporary music styles.
E. Takic
Takic is a branch of the Uto-Aztecan language family comprising several closely related Indigenous languages historically spoken in Southern California.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Sinoatrial node
Target entity description: The sinoatrial node is the heart’s natural pacemaker, a specialized cluster of cells that initiates and regulates the heartbeat by generating electrical impulses.

A. Einthoven triangle
The Einthoven triangle is a conceptual model in electrocardiography that represents the heart’s electrical activity using three limb leads arranged as an equilateral triangle around the torso.
B. Takic branch
The Takic branch is a subgroup of the Uto-Aztecan language family comprising several closely related Indigenous languages of Southern California.
C. Einthoven
Einthoven is a Dutch surname most notably associated with Willem Einthoven, the Nobel Prize–winning physiologist who invented the electrocardiogram (ECG).
D. Human Heart
"Human Heart" is a solo studio album by Iranian-Canadian musical theatre actor and singer Ramin Karimloo, showcasing his blend of theatrical and contemporary music styles.
E. Takic
Takic is a branch of the Uto-Aztecan language family comprising several closely related Indigenous languages historically spoken in Southern California.
F. None of above. chosen

Statements (51)

Predicate	Object
instanceOf	biological pacemaker ⓘ cardiac conduction system component ⓘ cluster of specialized cardiomyocytes ⓘ
associatedWithCondition	inappropriate sinus tachycardia ⓘ sick sinus syndrome ⓘ sinoatrial exit block ⓘ sinus arrest ⓘ sinus bradycardia ⓘ sinus tachycardia ⓘ
bloodSupply	circumflex branch of left coronary artery ⓘ right coronary artery ⓘ sinoatrial nodal artery ⓘ
canBeReplacedBy	artificial pacemaker ⓘ
composedOf	P cells ⓘ fibroblasts ⓘ pacemaker cells ⓘ transitional cells ⓘ
connectedTo	atrial myocardium ⓘ atrioventricular node ⓘ linked to: Atrioventricular node internodal pathways ⓘ
developsFrom	embryonic sinus venosus region ⓘ
discoveredBy	Arthur Keith ⓘ Martin Flack ⓘ
discoveryYear	1907 ⓘ
electrophysiologicalFeature	calcium-dependent upstroke of action potential ⓘ funny current (If) mediated by HCN channels ⓘ
foundInSpecies	humans ⓘ mammals ⓘ
function	coordinates atrial contraction onset ⓘ generates spontaneous electrical impulses ⓘ initiates normal heartbeat ⓘ regulates heart rate ⓘ sets sinus rhythm ⓘ
hasProperty	automaticity ⓘ dominant pacemaker under normal conditions ⓘ slow response action potentials ⓘ spontaneous diastolic depolarization ⓘ unstable resting membrane potential ⓘ
innervatedBy	parasympathetic fibers of the vagus nerve ⓘ sympathetic cardiac nerves ⓘ
locatedIn	right atrium of the heart ⓘ wall of the right atrium ⓘ
locatedNear	superior vena cava opening ⓘ
locatedSubregionOf	sulcus terminalis ⓘ
partOf	cardiac conduction system ⓘ heart ⓘ
regulates	sinus rhythm heart rate ⓘ
role	primary pacemaker of the heart ⓘ
stimulationEffectOf	parasympathetic activation decreases firing rate ⓘ sympathetic activation increases firing rate ⓘ
typicalRate	60–100 beats per minute in adults at rest ⓘ

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Heart → hasPart → Sinoatrial node ⓘ

Atrioventricular node → receivesImpulseFrom → sinoatrial node ⓘ

linked to: Sinoatrial node

M2 muscarinic acetylcholine receptor → primaryLocation → sinoatrial node ⓘ