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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 Heart2h 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

Choose the correct sequence of electrical current flow through the heart wall.

AV node, subendocardial conducting network, AV node, AV bundle, right and left bundle branches

SA node, subendocardial conducting network, AV node, AV bundle, right and left bundle branches

SA node, AV node, AV bundle, right and left bundle branches, subendocardial conducting network

subendocardial conducting network, AV node, AV bundle, right and left bundle branches, SA node

AV node, SA node, subendocardial conducting network, AV bundle, right and left bundle branches

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Verified step by step guidance

Understand the role of each component in the heart's electrical conduction system: The SA node (sinoatrial node) is the natural pacemaker of the heart, initiating the electrical impulse.

Recognize that the electrical impulse travels from the SA node to the AV node (atrioventricular node), which acts as a gatekeeper, slowing the impulse before it moves to the ventricles.

Identify that from the AV node, the impulse travels to the AV bundle (also known as the bundle of His), which is the only electrical connection between the atria and the ventricles.

Follow the path of the impulse as it moves from the AV bundle to the right and left bundle branches, which conduct the impulse through the interventricular septum.

Finally, the impulse reaches the subendocardial conducting network (Purkinje fibers), which distributes the impulse throughout the ventricles, causing them to contract.