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

Which autonomic nervous system response is most commonly associated with temporary widespread vasodilation and syncope?

Vasovagal response

Sympathetic activation

Fight-or-flight response

Baroreceptor reflex

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Verified step by step guidance

Understand the key terms in the question: 'autonomic nervous system response,' 'vasodilation,' and 'syncope.' The autonomic nervous system (ANS) regulates involuntary physiological processes, including heart rate, blood pressure, and vascular tone. Vasodilation refers to the widening of blood vessels, and syncope is a temporary loss of consciousness due to reduced blood flow to the brain.

Identify the physiological mechanism that links vasodilation and syncope. Widespread vasodilation can lead to a sudden drop in blood pressure (hypotension), which reduces blood flow to the brain, potentially causing syncope.

Review the options provided: (1) Vasovagal response, (2) Sympathetic activation, (3) Fight-or-flight response, and (4) Baroreceptor reflex. Consider which of these is most commonly associated with widespread vasodilation and syncope.

Analyze the vasovagal response. This is a reflex mediated by the parasympathetic nervous system, often triggered by emotional stress, pain, or standing for long periods. It involves a combination of bradycardia (slowing of the heart rate) and vasodilation, leading to a drop in blood pressure and potential syncope.

Compare the other options: Sympathetic activation and the fight-or-flight response are associated with increased heart rate and vasoconstriction, not vasodilation. The baroreceptor reflex helps regulate blood pressure but does not typically cause widespread vasodilation and syncope. Therefore, the vasovagal response is the most appropriate answer.