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

Which of the following correctly lists the main components of the cardiac conduction system in the order that an electrical impulse travels through the heart?

Atrioventricular node, sinoatrial node, Purkinje fibers, bundle branches, bundle of His

Purkinje fibers, bundle branches, bundle of His, atrioventricular node, sinoatrial node

Bundle of His, sinoatrial node, atrioventricular node, Purkinje fibers, bundle branches

Sinoatrial node, atrioventricular node, bundle of His, bundle branches, Purkinje fibers

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Verified step by step guidance

Step 1: Understand the cardiac conduction system, which is responsible for initiating and propagating electrical impulses that control the heart's rhythm and contraction.

Step 2: Identify the main components of the cardiac conduction system: the sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, bundle branches, and Purkinje fibers.

Step 3: Recognize the sequence of electrical impulse travel: The impulse begins at the sinoatrial (SA) node, which is the natural pacemaker of the heart, located in the right atrium.

Step 4: The impulse then travels to the atrioventricular (AV) node, which delays the signal slightly to allow the atria to contract and fill the ventricles with blood.

Step 5: From the AV node, the impulse moves to the bundle of His, then splits into the bundle branches, and finally reaches the Purkinje fibers, which distribute the signal throughout the ventricles to ensure coordinated contraction.