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Electrical

Electrical Conduction System of the Heart

QuestionAnswer
What is the function of the sinoatrial (SA) node? It acts as the natural pacemaker of the heart, initiating electrical impulses that cause the heart to beat.
Where is the SA node located? In the upper wall of the right atrium
What happens after the SA node generates an electrical impulse? The impulse spreads through the atria, causing them to contract.
What is the function of the atrioventricular (AV) node? It delays the impulse slightly before passing it to the ventricles, allowing the atria to empty completely.
Where is the AV node located? In the lower part of the right atrium near the septum.
What structure carries the impulse from the AV node to the ventricles? The Bundle of His.
What do the Purkinje fibers do in the conduction system? They distribute the electrical impulse throughout the ventricular muscles, causing ventricular contraction.
What is the correct order of structures in the electrical conduction pathway of the heart? SA node → AV node → Bundle of His → Right and Left Bundle Branches → Purkinje fibers.
What does an electrocardiogram (ECG or EKG) measure? The electrical activity of the heart.
Why is the delay at the AV node important? It ensures the atria have time to contract and empty blood into the ventricles before the ventricles contract.
Created by: Dominique Daigl
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