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

Sympathetic Nervous System

Anatomy & Physiology

14. The Autonomic Nervous System

Sympathetic Nervous System

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Multiple Choice

Sympathetic fibers cause which of the following effects on the coronary arteries?

Constriction

No change

Dilation

Occlusion

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Verified step by step guidance

Understand the role of the sympathetic nervous system: The sympathetic fibers are part of the autonomic nervous system, which is responsible for the 'fight or flight' response. This system generally prepares the body for increased activity by increasing heart rate, dilating airways, and redirecting blood flow to essential organs.

Recognize the function of coronary arteries: Coronary arteries supply oxygen-rich blood to the heart muscle. During increased physical activity or stress, the heart requires more oxygen to sustain its workload.

Analyze the effect of sympathetic stimulation on coronary arteries: Sympathetic fibers release neurotransmitters like norepinephrine, which bind to beta-adrenergic receptors in the coronary arteries. This binding causes the smooth muscle in the arterial walls to relax, leading to dilation (widening) of the arteries.

Understand why dilation occurs: Dilation of the coronary arteries increases blood flow to the heart muscle, ensuring it receives sufficient oxygen and nutrients during heightened activity or stress.

Conclude the correct effect: Based on the physiological response described, sympathetic fibers cause dilation of the coronary arteries, not constriction, occlusion, or no change.