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 primary pacemaker of the heart?

Atrioventricular (AV) node

Bundle of His

Sinoatrial (SA) node

Purkinje fibers

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Verified step by step guidance

Understand the role of a pacemaker in the heart: The pacemaker is responsible for initiating the electrical impulses that set the rhythm for the heart's contractions.

Identify the location and function of the Sinoatrial (SA) node: The SA node is located in the right atrium of the heart and is known as the primary pacemaker because it generates electrical impulses at the highest frequency.

Compare the SA node with other components: The Atrioventricular (AV) node, Bundle of His, and Purkinje fibers are part of the heart's conduction system but do not initiate the heartbeat. They help propagate the impulse generated by the SA node.

Recognize the hierarchy of pacemakers: The SA node is the primary pacemaker, followed by the AV node, which can take over if the SA node fails, but at a slower rate.

Conclude that the Sinoatrial (SA) node is the primary pacemaker of the heart, responsible for setting the pace of the heartbeat under normal physiological conditions.