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 sequence of components in the heart's electrical conduction system?

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

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

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

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

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Verified step by step guidance

Step 1: Understand the heart's electrical conduction system, which is responsible for initiating and coordinating the contraction of the heart muscles. The sequence of electrical signals ensures the heart pumps blood effectively.

Step 2: Begin with the Sinoatrial (SA) node, often referred to as the heart's natural pacemaker. It generates electrical impulses that initiate the heartbeat and is located in the right atrium.

Step 3: The electrical impulse travels from the SA node to the Atrioventricular (AV) node, which is located at the junction between the atria and ventricles. The AV node delays the signal slightly to allow the atria to contract fully before the ventricles contract.

Step 4: From the AV node, the signal moves to the Bundle of His, a pathway of specialized fibers located in the interventricular septum. The Bundle of His transmits the signal to the ventricles.

Step 5: Finally, the electrical impulse travels through the Purkinje fibers, which are distributed throughout the walls of the ventricles. These fibers ensure the ventricles contract in a coordinated manner, pumping blood out of the heart.