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 is the correct order of impulse conduction through the conduction system in the heart?

Bundle of His → Sinoatrial (SA) node → Atrioventricular (AV) node → Purkinje fibers → Right and left bundle branches

Sinoatrial (SA) node → Atrioventricular (AV) node → Bundle of His → Right and left bundle branches → Purkinje fibers

Sinoatrial (SA) node → Bundle of His → Atrioventricular (AV) node → Right and left bundle branches → Purkinje fibers

Atrioventricular (AV) node → Sinoatrial (SA) node → Bundle of His → Purkinje fibers → Right and left bundle branches

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Verified step by step guidance

Step 1: Understand the conduction system of the heart, which is responsible for generating and transmitting electrical impulses to ensure coordinated contraction of the heart chambers.

Step 2: Learn the key components of the conduction system: the Sinoatrial (SA) node, Atrioventricular (AV) node, Bundle of His, right and left bundle branches, and Purkinje fibers.

Step 3: Recognize the correct sequence of impulse conduction: The impulse starts at the Sinoatrial (SA) node, which is the natural pacemaker of the heart, and spreads through the atria causing them to contract.

Step 4: The impulse then reaches the Atrioventricular (AV) node, where it is delayed briefly to allow the ventricles to fill with blood before contraction.

Step 5: From the AV node, the impulse travels to the Bundle of His, then to the right and left bundle branches, and finally to the Purkinje fibers, which distribute the impulse throughout the ventricles, causing them to contract.