Table of contents

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1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 39m
3. Energy & Cell Processes10h 8m
4. Tissues & Histology10h 3m
5. Integumentary System2h 28m
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 System3h 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 __________ nerve carries parasympathetic fibers to the sinoatrial (SA) node.

facial

hypoglossal

vagus

accessory

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Verified step by step guidance

Identify the role of the sinoatrial (SA) node in the heart. The SA node is responsible for initiating the electrical impulses that set the pace for the heart rate.

Understand the function of parasympathetic fibers. These fibers are part of the autonomic nervous system and help to decrease heart rate by influencing the SA node.

Recognize the cranial nerves involved in parasympathetic innervation. The vagus nerve (cranial nerve X) is the primary nerve that carries parasympathetic fibers to the heart.

Differentiate between the cranial nerves listed: facial (VII), hypoglossal (XII), and accessory (XI). None of these nerves are responsible for carrying parasympathetic fibers to the heart.

Conclude that the vagus nerve is the correct answer, as it is the nerve that carries parasympathetic fibers to the SA node, influencing heart rate.