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 is the correct conduction pathway through the heart?

Purkinje fibers → Bundle of His → AV node → SA node

AV node → SA node → Purkinje fibers → Bundle of His

Bundle of His → SA node → AV node → Purkinje fibers

SA node → AV node → Bundle of His → Purkinje fibers

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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 sequence of structures involved in the conduction pathway: the sinoatrial (SA) node, atrioventricular (AV) node, Bundle of His, and Purkinje fibers. The SA node is the pacemaker of the heart, initiating the electrical impulse.

Step 3: Recognize that the electrical impulse travels from the SA node to the AV node, where it is briefly delayed to allow the atria to contract and fill the ventricles with blood.

Step 4: After the AV node, the impulse moves to the Bundle of His, which is located in the interventricular septum and serves as a pathway for the impulse to travel to the ventricles.

Step 5: Finally, the impulse is transmitted to the Purkinje fibers, which spread throughout the ventricular walls, causing the ventricles to contract and pump blood to the lungs and the rest of the body.