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 sequence of events in the transmission of an impulse through the heart muscle?

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

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

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

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

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Verified step by step guidance

Begin by understanding the role of each component in the heart's conduction system. The Sinoatrial (SA) node is the heart's natural pacemaker, initiating the electrical impulse.

The impulse travels from the SA node to the Atrioventricular (AV) node. The AV node acts as a gatekeeper, slowing down the impulse before it moves to the ventricles, allowing the atria to contract and fill the ventricles with blood.

Next, the impulse moves from the AV node to the Bundle of His. The Bundle of His is a pathway that transmits the impulse from the AV node to the ventricles.

The impulse then travels through the Bundle of His to the Purkinje fibers. These fibers distribute the impulse throughout the ventricles, causing them to contract and pump blood to the lungs and the rest of the body.

Review the sequence: Sinoatrial node -> Atrioventricular node -> Bundle of His -> Purkinje fibers. This is the correct order of impulse transmission through the heart muscle.