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

14. The Autonomic Nervous System

Introduction to the Autonomic Nervous System

Anatomy & Physiology

14. The Autonomic Nervous System

Introduction to the Autonomic Nervous System

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Multiple Choice

A patient has sinus bradycardia with a heart rate of 36 beats per minute. Which division of the autonomic nervous system is most likely responsible for this condition?

Enteric nervous system

Parasympathetic nervous system

Sympathetic nervous system

Somatic nervous system

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Verified step by step guidance

Understand the condition: Sinus bradycardia refers to a slower-than-normal heart rate, typically below 60 beats per minute. In this case, the heart rate is 36 beats per minute, which is significantly slow.

Review the role of the autonomic nervous system: The autonomic nervous system regulates involuntary functions like heart rate, digestion, and respiratory rate. It has two main divisions: the sympathetic and parasympathetic nervous systems.

Analyze the parasympathetic nervous system: The parasympathetic nervous system is responsible for 'rest and digest' activities. It slows down the heart rate by releasing acetylcholine, which acts on the sinoatrial (SA) node of the heart.

Contrast with the sympathetic nervous system: The sympathetic nervous system is responsible for 'fight or flight' responses. It increases heart rate and cardiac output by releasing norepinephrine and stimulating the SA node.

Eliminate irrelevant options: The somatic nervous system controls voluntary muscle movements and is not involved in heart rate regulation. The enteric nervous system primarily governs gastrointestinal functions. Based on the physiological role, the parasympathetic nervous system is most likely responsible for sinus bradycardia.