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

The heart contracts because of an electrical impulse. Where in the heart does this impulse start?

Sinoatrial (SA) node

Purkinje fibers

Bundle of His

Atrioventricular (AV) node

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Verified step by step guidance

Understand the role of electrical impulses in heart contraction: The heart contracts due to electrical impulses that trigger the cardiac muscle cells to contract in a coordinated manner.

Identify the starting point of the electrical impulse: The impulse originates in a specific part of the heart known as the pacemaker.

Learn about the Sinoatrial (SA) node: The SA node is located in the right atrium and is responsible for initiating the electrical impulse that causes the heart to contract.

Differentiate between the SA node and other components: While the SA node starts the impulse, other structures like the AV node, Bundle of His, and Purkinje fibers help propagate the impulse throughout the heart.

Recognize the sequence of impulse propagation: The impulse travels from the SA node to the AV node, then to the Bundle of His, and finally through the Purkinje fibers, ensuring coordinated contraction of the heart chambers.