Which structure is the normal electrical connection between the atria and ventricles?

Which structure is the normal electrical connection between the atria and ventricles?

• A. AV node
• B. Bundle of His
• C. Sinoatrial node
• D. Purkinje fibers

Answer: (A)

The normal electrical connection between the atria and ventricles is provided by the atrioventricular (AV) node. Located at the junction of the atria and ventricles, the AV node receives impulses from the sinoatrial node and introduces a necessary delay in conduction. This pause lets the atria finish contracting and complete ventricular filling before the ventricles are stimulated to contract. After this delay, the impulse travels through the His bundle and Purkinje fibers to coordinate the ventricles’ rhythm. The sinoatrial node is the start of the electrical impulse (the natural pacemaker), while Purkinje fibers and the bundle of His are parts of the ventricular conducting pathway, not the direct atrioventricular bridge.

The normal electrical connection between the atria and ventricles is provided by the atrioventricular (AV) node. Located at the junction of the atria and ventricles, the AV node receives impulses from the sinoatrial node and introduces a necessary delay in conduction. This pause lets the atria finish contracting and complete ventricular filling before the ventricles are stimulated to contract. After this delay, the impulse travels through the His bundle and Purkinje fibers to coordinate the ventricles’ rhythm. The sinoatrial node is the start of the electrical impulse (the natural pacemaker), while Purkinje fibers and the bundle of His are parts of the ventricular conducting pathway, not the direct atrioventricular bridge.