What sequence describes the flow of electrical impulses in the heart?

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

Answer: (A)

Verified step by step guidance

1. Understand that the heart's electrical conduction system is responsible for initiating and coordinating the heartbeat.
2. Identify the primary pacemaker of the heart, which is the Sinoatrial (SA) node, located in the right atrium. It generates electrical impulses that initiate the heartbeat.
3. Recognize that the electrical impulse travels from the SA node to the Atrioventricular (AV) node, which is located at the junction between the atria and ventricles. The AV node acts as a gatekeeper, slowing down the impulse before it passes to the ventricles.
4. Follow the pathway as the impulse moves from the AV node to the Bundle of His, which is a collection of heart muscle cells specialized for electrical conduction. The Bundle of His transmits the impulse to the ventricles.
5. Finally, the impulse travels through the Purkinje fibers, which are a network of fibers that spread throughout the ventricles, causing them to contract and pump blood out of the heart.