AV NODE Meaning and
Definition
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The AV (atrioventricular) node is an important component of the electrical conducting system of the heart. It is a specialized region of the cardiac tissue located in the septal wall of the right atrium, near the tricuspid valve. The primary function of the AV node is to relay electrical signals received from the sinoatrial (SA) node, which is the heart's natural pacemaker.
The AV node acts as a filter or delay point, allowing the atria to contract and force blood into the ventricles before the ventricles themselves contract. This delay ensures efficient blood flow and coordination between the atria and ventricles. The AV node conducts electrical impulses at a slower rate than the SA node, allowing time for the atria to fully contract and fill the ventricles before ventricular contraction is initiated.
The AV node is responsible for controlling the heart rate and rhythm, as it determines the rate at which electrical impulses are sent to the ventricles. This regulation ensures that the heart beats at a steady and coordinated pace, preventing irregularities such as atrial fibrillation.
In summary, the AV node is a crucial structure in the heart's electrical conducting system. It serves as a delay point, allowing the atria to contract fully before the ventricles contract, ensuring effective blood flow. Additionally, the AV node controls the heart rate and rhythm by determining the rate at which electrical impulses are transmitted to the ventricles.
Common Misspellings for AV NODE
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Etymology of AV NODE
The term "AV node" is an abbreviation for the atrioventricular node. The etymology of this term can be broken down as follows:
1. Atrio-: This prefix derives from the Latin word "atrium", meaning "entrance hall" or "vestibule". In the context of the heart, it refers to the two upper chambers called the atria.
2. Ventricular: This word comes from the Latin term "ventriculus", which means "little belly". It refers to the two lower chambers of the heart, known as the ventricles.
3. Node: The term "node" comes from the Latin word "nodus", meaning "knot". In this context, it refers to a small mass of tissue in the heart that exhibits electrical conduction properties.
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