Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

18. The Heart

Electrical Conduction System of the Heart

Anatomy & Physiology

18. The Heart

Electrical Conduction System of the Heart

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Multiple Choice

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

Sinoatrial node, Atrioventricular node, Bundle of His, Purkinje fibers

Bundle of His, Purkinje fibers, Atrioventricular node, Sinoatrial node

Atrioventricular node, Sinoatrial node, Purkinje fibers, Bundle of His

Purkinje fibers, Bundle of His, Sinoatrial node, Atrioventricular node

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Verified step by step guidance

Understand that the heart's electrical conduction system is responsible for initiating and coordinating the heartbeat.

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.

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.

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.

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.