Photo taken by Dr. Haus
The Heart's Conduction System
The heart's conduction system is the part of the heart that allows the heart to beat. The conduction system is made up of the electrical wiring and structures that give the heart the signals to beat.
Without the conduction system, the heart would not receive the electrical signals it needs to undergo a contraction in order to pump the blood.
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Heart Conduction System "Anatomy"
The heart's conduction system is made up of nerve cells and specialized muscle cells that create, conduct, and deliver the electrical signals to allow the heart to beat.
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Steps of Heart Conduction
- Electrical signal begins at the sinus (SV) node in the right atrium
- Electrical signal leaves the SV node and travels to the atrioventricular (AV) node. As it travels to the AV node the right and left atria contract
- Electrical signal arrives at AV node which sits between the atria and the ventricles
- Electrical signal leaves the AV node and travels down the bundles of His that are located between the left and right ventricles. NO contraction happens here as the bundles of His are insulated from the left and right ventricles
- Electrical signal enters the Purkinje fibers that continue to the left and right ventricles. The left and right ventricles contract as the Purkinje fibers receive the electrical signal
Key:
1. Sinus (SV) node
2. Atrioventicular (AV) node
3. Bundles of His
4. Purkinje fibers
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