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

It is the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node.

From Textbooks • Jun. 9, 2022

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

From Textbooks • Jun. 9, 2022

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

How does the delay of the impulse at the atrioventricular node contribute to cardiac function?

From Textbooks • Jun. 19, 2013