atrioventricular node

American  

noun

Anatomy.

1. a small mass of muscular fibers at the base of the wall between the atria, conducting impulses received from the sinoatrial node by way of the atrioventricular bundles and, under certain conditions, functioning for the sinoatrial node as pacemaker of the heart.

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atrioventricular node Scientific  

/ ā′trē-ō-vĕn-trĭk′yə-lər /

1. A small area of specialized cardiac muscle cells that conducts impulses from the sinoatrial node to the ventricles and initiates the contraction of the ventricles. It is located in the right atrium.

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Etymology

Origin of atrioventricular node

First recorded in 1930–35

Example Sentences

See Examples For:

atrioventricular node

The ventricles would contract, but the atria would not, because the atrioventricular node passes the signal to the Purkinje fibers, which causes the atria to contract.

From Textbooks ● Jun. 9, 2022

Explain fully how the cardiac cycle would be affected if the signal was blocked at the atrioventricular node and why.

From Textbooks ● Jun. 9, 2022

Electrical charges pulse from the SA node causing the two atria to contract in unison; then the pulse reaches the atrioventricular node between the right atrium and right ventricle.

From Textbooks ● Jun. 9, 2022

Figure 19.19 illustrates the initiation of the impulse in the SA node that then spreads the impulse throughout the atria to the atrioventricular node.

From Textbooks ● Jun. 19, 2013

This impulse spreads from its initiation in the SA node throughout the atria through specialized internodal pathways, to the atrial myocardial contractile cells and the atrioventricular node.

From Textbooks ● Jun. 19, 2013